diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 84a8c85..f9176fe 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -59,9 +59,11 @@ jobs:
           node-version: '24'
           cache: npm
       - run: npm ci
-      # Builds from the committed apps.json (vendored fixture) — no token/network.
+      # Builds from the vendored fixtures — no token/network. setup-test-apps
+      # copies the real mermaid bundle into the single-page fixture (gitignored),
+      # so the container suite's diagram assertions have something to render.
       - name: Build (headless)
-        run: npm run build:headless
+        run: node scripts/setup-test-apps.mjs && npm run build:headless
       - name: Upload dist artifact
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
diff --git a/.gitignore b/.gitignore
index bc91f06..75d67aa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,5 @@ playwright-report/
 test-results/
 .astro/
 public/
+# Copied from node_modules by scripts/setup-test-apps.mjs on every run.
+tests/fixtures/single-page-bundle/*/assets/mermaid.min.js
diff --git a/CLAUDE.md b/CLAUDE.md
index d4e4761..9bcb1b3 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -77,7 +77,7 @@ Orchestrator: `scripts/build-vite.js`. Flags: `--local`, `--headless`.
 - `src/components/Masthead.astro` — Persistent Knowledge base header + Library/current-app sub-nav (all pages, both modes)
 - `src/components/AppCard.astro`, `src/components/AppIcon.astro` — Catalog card and its icon
 - `src/templates/shadow-compat.js` — Shadow-DOM design-token styles, injected into the body by the layout
-- `src/scripts/embedded-transitions.js` — Loaded by the layout; inert standalone. Inside a web fragment it runs Astro's view transition on the host document (the iframe's is never painted) and replaces Astro's swap with one that targets reframed's `wf-html`/`wf-head`/`wf-body`, because the default swap nests a new `wf-html` per navigation and leaks every stylesheet. Its head diff never moves a reused node: on a pierced page a `<link>` already moved once by reframed's portal falls out of the applied stylesheets when moved again
+- `src/scripts/embedded-transitions.js` — Loaded by the layout; inert standalone. Inside a web fragment it runs Astro's view transition on the host document (the iframe's is never painted) and replaces Astro's swap with one that targets reframed's `wf-html`/`wf-head`/`wf-body`, because the default swap nests a new `wf-html` per navigation and leaks every stylesheet. Its head diff never moves a reused node: on a pierced page a `<link>` already moved once by reframed's portal falls out of the applied stylesheets when moved again. It also imports the fetched head and body into the host document before swapping them in: reframed routes a script into its iframe only through host-realm DOM methods, and the router's page is parsed in the iframe, so Astro's `script.replaceWith()` re-run would otherwise execute every swapped-in sub-app script in the host window
 - `src/utils/config.js` — `PATH_PREFIX`/`BASE_PATH`, `isHeadlessBuild()` and `REGISTRY_FILE` — the build-wide constants
 - `src/utils/registry.js` — Registry validation, manifest reading/validation, expansion map. Shared by the build and by Astro so both resolve the same registry
 - `scripts/build-vite.js` — Build orchestrator (4 steps: prepare, hoist, copy assets, astro build)
@@ -148,7 +148,9 @@ Self-contained Playwright E2E — `npm test` auto-starts everything (no external
 1. **:3000 fragment** — `scripts/setup-test-apps.mjs` writes a hermetic `apps.json` that
    registers the vendored `tests/fixtures/docs-example.kb-docs.tar.gz` (two apps)
    (slugs `user-guide` + `guide-mirror`, for cross-app nav), an iframe entry pinned
-   `"headless": false`, and the generated single-page bundle fixture. `build:headless` builds it;
+   `"headless": false`, and the generated single-page bundle fixture — with the real
+   mermaid bundle, copied from the root `mermaid` devDependency (pinned to the version
+   `actions/` vendors) and gitignored. `build:headless` builds it;
    `tests/fragment-server.mjs` serves `dist/` mirroring the production **nginx** rewrites
    (`/__wf/knowledge-base/*` → `/knowledge-base/*`). NB: `astro preview` is NOT used — its
    Vite `configurePreviewServer` rewrite hook does not run for static output, so the
@@ -181,6 +183,9 @@ Every embedded test runs twice, as Playwright projects `chromium` (:4201) and
   not leak in), routing + smooth no-reload SPA transitions, cross-app navigation, asset
   loading (no host-origin 404s), and the documented history limitation (fragment routing is
   internal to the reframed `wf:<id>` iframe and is not mirrored to top-window history).
+  Mermaid: the fixture flowchart renders to SVG on a hard load, after router navigation into
+  the doc and after leaving and coming back, and the bundle runs in the fragment's iframe,
+  never on the host window.
 - `host-router.spec.js` — the ClientRouter next to the HOST's router. The shell loads
   `tests/host/host-router.js`, an Angular Router stand-in (owns the address bar with its own
   history state and trailing-slash stripping, re-routes on `popstate`, reuses the outlet when
diff --git a/package-lock.json b/package-lock.json
index 0570bd9..ba8b0cc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -22,6 +22,7 @@
         "astro": "^7.0.4",
         "chokidar": "^5.0.0",
         "express": "^5.2.1",
+        "mermaid": "11.4.1",
         "tailwindcss": "^4.0.0",
         "typescript": "^6.0.3",
         "web-fragments": "^0.8.2"
@@ -30,6 +31,28 @@
         "node": ">=24"
       }
     },
+    "node_modules/@antfu/install-pkg": {
+      "version": "1.1.0",
+      "integrity": "sha512-MGQsmw10ZyI+EJo45CdSER4zEb+p31LpDAFp2Z3gkSd1yqVZGi0Ebx++YTEMonJy4oChEMLsxZ64j8FH6sSqtQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "package-manager-detector": "^1.3.0",
+        "tinyexec": "^1.0.1"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      }
+    },
+    "node_modules/@antfu/utils": {
+      "version": "8.1.1",
+      "integrity": "sha512-Mex9nXf9vR6AhcXmMrlz/HVgYYZpVGJ6YlPgwl7UnaFpnshXs6EK/oa5Gpf3CzENMjkvEx2tQtntGnb7UtSTOQ==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      }
+    },
     "node_modules/@astrojs/check": {
       "version": "0.9.10",
       "integrity": "sha512-zgx/UQMozdjOa3bOxjgeCFdtpE3c9rRX6xHwa+2QXvy8z8Akifu2AtubHyv/zzC2znO8dl8fFWL4K+Ba9kS8HQ==",
@@ -410,6 +433,12 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@braintree/sanitize-url": {
+      "version": "7.1.2",
+      "integrity": "sha512-jigsZK+sMF/cuiB7sERuo9V7N9jx+dhmHHnQyDSVdpZwVutaBu7WvNYqMDLSgFgfB30n452TP3vjDAvFC973mA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@bruits/satteri-darwin-arm64": {
       "version": "0.9.5",
       "integrity": "sha512-iw4nZgx9v30lWo/MTngQqi1pI78KI0DnkSm+lVJGYdmPLgAyDNJigVhpG42/Iq55A6c1Ll8q66ljyyRiQUxwow==",
@@ -575,6 +604,57 @@
         "node": ">=18"
       }
     },
+    "node_modules/@chevrotain/cst-dts-gen": {
+      "version": "11.0.3",
+      "integrity": "sha512-BvIKpRLeS/8UbfxXxgC33xOumsacaeCKAjAeLyOn7Pcp95HiRbrpl14S+9vaZLolnbssPIUuiUd8IvgkRyt6NQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/gast": "11.0.3",
+        "@chevrotain/types": "11.0.3",
+        "lodash-es": "4.17.21"
+      }
+    },
+    "node_modules/@chevrotain/cst-dts-gen/node_modules/lodash-es": {
+      "version": "4.17.21",
+      "integrity": "sha512-mKnC+QJ9pWVzv+C4/U3rRsHapFfHvQFoFB92e52xeyGMcX6/OlIl78je1u8vePzYZSkkogMPJ2yjxxsb89cxyw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@chevrotain/gast": {
+      "version": "11.0.3",
+      "integrity": "sha512-+qNfcoNk70PyS/uxmj3li5NiECO+2YKZZQMbmjTqRI3Qchu8Hig/Q9vgkHpI3alNjr7M+a2St5pw5w5F6NL5/Q==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/types": "11.0.3",
+        "lodash-es": "4.17.21"
+      }
+    },
+    "node_modules/@chevrotain/gast/node_modules/lodash-es": {
+      "version": "4.17.21",
+      "integrity": "sha512-mKnC+QJ9pWVzv+C4/U3rRsHapFfHvQFoFB92e52xeyGMcX6/OlIl78je1u8vePzYZSkkogMPJ2yjxxsb89cxyw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@chevrotain/regexp-to-ast": {
+      "version": "11.0.3",
+      "integrity": "sha512-1fMHaBZxLFvWI067AVbGJav1eRY7N8DDvYCTwGBiE/ytKBgP8azTdgyrKyWZ9Mfh09eHWb5PgTSO8wi7U824RA==",
+      "dev": true,
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/types": {
+      "version": "11.0.3",
+      "integrity": "sha512-gsiM3G8b58kZC2HaWR50gu6Y1440cHiJ+i3JUvcp/35JchYejb2+5MVeJK0iKThYpAa/P2PYFV4hoi44HD+aHQ==",
+      "dev": true,
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/utils": {
+      "version": "11.0.3",
+      "integrity": "sha512-YslZMgtJUyuMbZ+aKvfF3x1f5liK4mWNxghFRv7jqRR9C3R3fAOGTTKvxXDa2Y1s9zSbcpuO0cAxDYsc9SrXoQ==",
+      "dev": true,
+      "license": "Apache-2.0"
+    },
     "node_modules/@clack/core": {
       "version": "1.4.3",
       "integrity": "sha512-/kr3UWNtdJfxZtPgDqUOmG2pvwlmcLGheex5yiZKdwbzZJxhV+HMNR9QNmyY5cGwTNV6LrR7Jtp+KjhUAP1qBQ==",
@@ -1113,6 +1193,28 @@
         "url": "https://github.com/sponsors/ayuhito"
       }
     },
+    "node_modules/@iconify/types": {
+      "version": "2.0.0",
+      "integrity": "sha512-+wluvCrRhXrhyOmRDJ3q8mux9JkKy5SJ/v8ol2tu4FVjyYvtEzkc/3pK15ET6RKg4b4w4BmTk1+gsCUhf21Ykg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@iconify/utils": {
+      "version": "2.3.0",
+      "integrity": "sha512-GmQ78prtwYW6EtzXRU1rY+KwOKfz32PD7iJh6Iyqw68GiKuoZ2A6pRtzWONz5VQJbp50mEjXh/7NkumtrAgRKA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@antfu/install-pkg": "^1.0.0",
+        "@antfu/utils": "^8.1.0",
+        "@iconify/types": "^2.0.0",
+        "debug": "^4.4.0",
+        "globals": "^15.14.0",
+        "kolorist": "^1.8.0",
+        "local-pkg": "^1.0.0",
+        "mlly": "^1.7.4"
+      }
+    },
     "node_modules/@img/colour": {
       "version": "1.1.0",
       "integrity": "sha512-Td76q7j57o/tLVdgS746cYARfSyxk8iEfRxewL9h4OMzYhbW4TAcppl0mT4eyqXddh6L/jwoM75mo7ixa/pCeQ==",
@@ -1659,6 +1761,15 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@mermaid-js/parser": {
+      "version": "0.3.0",
+      "integrity": "sha512-HsvL6zgE5sUPGgkIDlmAWR1HTNHz2Iy11BAWPTa4Jjabkpguy4Ze2gzfLrg6pdRuBvFwgUYyxiaNqZwrEEXepA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "langium": "3.0.0"
+      }
+    },
     "node_modules/@napi-rs/wasm-runtime": {
       "version": "1.2.2",
       "integrity": "sha512-JfB4kuJQjaoHuCTseIINHtHWeJnvgEcxjwA5t/Y00ZgaOO1Crz3fjT/p8kT28zA/Caz7oiUMn3d6H2yOVCVwuw==",
@@ -2375,6 +2486,259 @@
         "tslib": "^2.4.0"
       }
     },
+    "node_modules/@types/d3": {
+      "version": "7.4.3",
+      "integrity": "sha512-lZXZ9ckh5R8uiFVt8ogUNf+pIrK4EsWrx2Np75WvF/eTpJ0FMHNhjXk8CKEx/+gpHbNQyJWehbFaTvqmHWB3ww==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-array": "*",
+        "@types/d3-axis": "*",
+        "@types/d3-brush": "*",
+        "@types/d3-chord": "*",
+        "@types/d3-color": "*",
+        "@types/d3-contour": "*",
+        "@types/d3-delaunay": "*",
+        "@types/d3-dispatch": "*",
+        "@types/d3-drag": "*",
+        "@types/d3-dsv": "*",
+        "@types/d3-ease": "*",
+        "@types/d3-fetch": "*",
+        "@types/d3-force": "*",
+        "@types/d3-format": "*",
+        "@types/d3-geo": "*",
+        "@types/d3-hierarchy": "*",
+        "@types/d3-interpolate": "*",
+        "@types/d3-path": "*",
+        "@types/d3-polygon": "*",
+        "@types/d3-quadtree": "*",
+        "@types/d3-random": "*",
+        "@types/d3-scale": "*",
+        "@types/d3-scale-chromatic": "*",
+        "@types/d3-selection": "*",
+        "@types/d3-shape": "*",
+        "@types/d3-time": "*",
+        "@types/d3-time-format": "*",
+        "@types/d3-timer": "*",
+        "@types/d3-transition": "*",
+        "@types/d3-zoom": "*"
+      }
+    },
+    "node_modules/@types/d3-array": {
+      "version": "3.2.2",
+      "integrity": "sha512-hOLWVbm7uRza0BYXpIIW5pxfrKe0W+D5lrFiAEYR+pb6w3N2SwSMaJbXdUfSEv+dT4MfHBLtn5js0LAWaO6otw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-axis": {
+      "version": "3.0.6",
+      "integrity": "sha512-pYeijfZuBd87T0hGn0FO1vQ/cgLk6E1ALJjfkC0oJ8cbwkZl3TpgS8bVBLZN+2jjGgg38epgxb2zmoGtSfvgMw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-selection": "*"
+      }
+    },
+    "node_modules/@types/d3-brush": {
+      "version": "3.0.6",
+      "integrity": "sha512-nH60IZNNxEcrh6L1ZSMNA28rj27ut/2ZmI3r96Zd+1jrZD++zD3LsMIjWlvg4AYrHn/Pqz4CF3veCxGjtbqt7A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-selection": "*"
+      }
+    },
+    "node_modules/@types/d3-chord": {
+      "version": "3.0.6",
+      "integrity": "sha512-LFYWWd8nwfwEmTZG9PfQxd17HbNPksHBiJHaKuY1XeqscXacsS2tyoo6OdRsjf+NQYeB6XrNL3a25E3gH69lcg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-color": {
+      "version": "3.1.3",
+      "integrity": "sha512-iO90scth9WAbmgv7ogoq57O9YpKmFBbmoEoCHDB2xMBY0+/KVrqAaCDyCE16dUspeOvIxFFRI+0sEtqDqy2b4A==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-contour": {
+      "version": "3.0.6",
+      "integrity": "sha512-BjzLgXGnCWjUSYGfH1cpdo41/hgdWETu4YxpezoztawmqsvCeep+8QGfiY6YbDvfgHz/DkjeIkkZVJavB4a3rg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-array": "*",
+        "@types/geojson": "*"
+      }
+    },
+    "node_modules/@types/d3-delaunay": {
+      "version": "6.0.4",
+      "integrity": "sha512-ZMaSKu4THYCU6sV64Lhg6qjf1orxBthaC161plr5KuPHo3CNm8DTHiLw/5Eq2b6TsNP0W0iJrUOFscY6Q450Hw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-dispatch": {
+      "version": "3.0.7",
+      "integrity": "sha512-5o9OIAdKkhN1QItV2oqaE5KMIiXAvDWBDPrD85e58Qlz1c1kI/J0NcqbEG88CoTwJrYe7ntUCVfeUl2UJKbWgA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-drag": {
+      "version": "3.0.7",
+      "integrity": "sha512-HE3jVKlzU9AaMazNufooRJ5ZpWmLIoc90A37WU2JMmeq28w1FQqCZswHZ3xR+SuxYftzHq6WU6KJHvqxKzTxxQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-selection": "*"
+      }
+    },
+    "node_modules/@types/d3-dsv": {
+      "version": "3.0.7",
+      "integrity": "sha512-n6QBF9/+XASqcKK6waudgL0pf/S5XHPPI8APyMLLUHd8NqouBGLsU8MgtO7NINGtPBtk9Kko/W4ea0oAspwh9g==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-ease": {
+      "version": "3.0.2",
+      "integrity": "sha512-NcV1JjO5oDzoK26oMzbILE6HW7uVXOHLQvHshBUW4UMdZGfiY6v5BeQwh9a9tCzv+CeefZQHJt5SRgK154RtiA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-fetch": {
+      "version": "3.0.7",
+      "integrity": "sha512-fTAfNmxSb9SOWNB9IoG5c8Hg6R+AzUHDRlsXsDZsNp6sxAEOP0tkP3gKkNSO/qmHPoBFTxNrjDprVHDQDvo5aA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-dsv": "*"
+      }
+    },
+    "node_modules/@types/d3-force": {
+      "version": "3.0.10",
+      "integrity": "sha512-ZYeSaCF3p73RdOKcjj+swRlZfnYpK1EbaDiYICEEp5Q6sUiqFaFQ9qgoshp5CzIyyb/yD09kD9o2zEltCexlgw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-format": {
+      "version": "3.0.4",
+      "integrity": "sha512-fALi2aI6shfg7vM5KiR1wNJnZ7r6UuggVqtDA+xiEdPZQwy/trcQaHnwShLuLdta2rTymCNpxYTiMZX/e09F4g==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-geo": {
+      "version": "3.1.1",
+      "integrity": "sha512-65Emv9fQiQQqphLlRkuQ5ypPsOmWPhtBGCMv61JDPEPMvsx+gzhGf74yw1a78xFKPj6zw4AgQICJoQv0vK9M2w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/geojson": "*"
+      }
+    },
+    "node_modules/@types/d3-hierarchy": {
+      "version": "3.1.7",
+      "integrity": "sha512-tJFtNoYBtRtkNysX1Xq4sxtjK8YgoWUNpIiUee0/jHGRwqvzYxkq0hGVbbOGSz+JgFxxRu4K8nb3YpG3CMARtg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-interpolate": {
+      "version": "3.0.4",
+      "integrity": "sha512-mgLPETlrpVV1YRJIglr4Ez47g7Yxjl1lj7YKsiMCb27VJH9W8NVM6Bb9d8kkpG/uAQS5AmbA48q2IAolKKo1MA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-color": "*"
+      }
+    },
+    "node_modules/@types/d3-path": {
+      "version": "3.1.1",
+      "integrity": "sha512-VMZBYyQvbGmWyWVea0EHs/BwLgxc+MKi1zLDCONksozI4YJMcTt8ZEuIR4Sb1MMTE8MMW49v0IwI5+b7RmfWlg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-polygon": {
+      "version": "3.0.2",
+      "integrity": "sha512-ZuWOtMaHCkN9xoeEMr1ubW2nGWsp4nIql+OPQRstu4ypeZ+zk3YKqQT0CXVe/PYqrKpZAi+J9mTs05TKwjXSRA==",
+      "dev": true,
+      "license": "MIT"
+    },
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     "node_modules/kleur": {
       "version": "4.1.5",
       "integrity": "sha512-o+NO+8WrRiQEE4/7nwRJhN1HWpVmJm511pBHUxPLtp0BUISzlBplORYSmTclCnJvQq2tKu/sgl3xVpkc7ZWuQQ==",
@@ -4137,6 +5180,40 @@
         "node": ">=6"
       }
     },
+    "node_modules/kolorist": {
+      "version": "1.8.0",
+      "integrity": "sha512-Y+60/zizpJ3HRH8DCss+q95yr6145JXZo46OTpFvDZWLfRCE4qChOyk1b26nMaNpfHHgxagk9dXT5OP0Tfe+dQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/langium": {
+      "version": "3.0.0",
+      "integrity": "sha512-+Ez9EoiByeoTu/2BXmEaZ06iPNXM6thWJp02KfBO/raSMyCJ4jw7AkWWa+zBCTm0+Tw1Fj9FOxdqSskyN5nAwg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "chevrotain": "~11.0.3",
+        "chevrotain-allstar": "~0.3.0",
+        "vscode-languageserver": "~9.0.1",
+        "vscode-languageserver-textdocument": "~1.0.11",
+        "vscode-uri": "~3.0.8"
+      },
+      "engines": {
+        "node": ">=16.0.0"
+      }
+    },
+    "node_modules/langium/node_modules/vscode-uri": {
+      "version": "3.0.8",
+      "integrity": "sha512-AyFQ0EVmsOZOlAnxoFOGOq1SQDWAB7C6aqMGS23svWAllfOaxbuFvcT8D1i8z3Gyn8fraVeZNNmN6e9bxxXkKw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/layout-base": {
+      "version": "1.0.2",
+      "integrity": "sha512-8h2oVEZNktL4BH2JCOI90iD1yXwL6iNW7KcCKT2QZgQJR2vbqDsldCTPRU9NifTCqHZci57XvQQ15YTu+sTYPg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/lightningcss": {
       "version": "1.32.0",
       "integrity": "sha512-NXYBzinNrblfraPGyrbPoD19C1h9lfI/1mzgWYvXUTe414Gz/X1FD2XBZSZM7rRTrMA8JL3OtAaGifrIKhQ5yQ==",
@@ -4386,6 +5463,29 @@
         "url": "https://opencollective.com/parcel"
       }
     },
+    "node_modules/local-pkg": {
+      "version": "1.2.1",
+      "integrity": "sha512-++gUqRDEvcnN6Zhqrr+y/CkVEHhlrR96vZn3nZZPYzMcBUyBtTKzB9NadClFIsIVSsu+3i9tfk/erqy9kAmt7Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "mlly": "^1.7.4",
+        "pkg-types": "^2.3.0",
+        "quansync": "^0.2.11"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      }
+    },
+    "node_modules/lodash-es": {
+      "version": "4.18.1",
+      "integrity": "sha512-J8xewKD/Gk22OZbhpOVSwcs60zhd95ESDwezOFuA3/099925PdHJ7OFHNTGtajL3AlZkykD32HykiMo+BIBI8A==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/lru-cache": {
       "version": "11.5.2",
       "integrity": "sha512-4pfM1Ff0x50o0tQwb5ucw/RzNyD0/YJME6IVcStalZuMWxdt3sR3huStTtxz4PUmvZfRguvDejasvQ2kifR11g==",
@@ -4415,6 +5515,18 @@
         "source-map-js": "^1.2.1"
       }
     },
+    "node_modules/marked": {
+      "version": "13.0.3",
+      "integrity": "sha512-rqRix3/TWzE9rIoFGIn8JmsVfhiuC8VIQ8IdX5TfzmeBucdY05/0UlzKaw0eVtpcN/OdVFpBk7CjKGo9iHJ/zA==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "marked": "bin/marked.js"
+      },
+      "engines": {
+        "node": ">= 18"
+      }
+    },
     "node_modules/math-intrinsics": {
       "version": "1.1.0",
       "integrity": "sha512-/IXtbwEk5HTPyEwyKX6hGkYXxM9nbj64B+ilVJnC/R6B0pH5G4V3b0pVbL7DBj4tkhBAppbQUlf6F6Xl9LHu1g==",
@@ -4476,6 +5588,34 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/mermaid": {
+      "version": "11.4.1",
+      "integrity": "sha512-Mb01JT/x6CKDWaxigwfZYuYmDZ6xtrNwNlidKZwkSrDaY9n90tdrJTV5Umk+wP1fZscGptmKFXHsXMDEVZ+Q6A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@braintree/sanitize-url": "^7.0.1",
+        "@iconify/utils": "^2.1.32",
+        "@mermaid-js/parser": "^0.3.0",
+        "@types/d3": "^7.4.3",
+        "cytoscape": "^3.29.2",
+        "cytoscape-cose-bilkent": "^4.1.0",
+        "cytoscape-fcose": "^2.2.0",
+        "d3": "^7.9.0",
+        "d3-sankey": "^0.12.3",
+        "dagre-d3-es": "7.0.11",
+        "dayjs": "^1.11.10",
+        "dompurify": "^3.2.1",
+        "katex": "^0.16.9",
+        "khroma": "^2.1.0",
+        "lodash-es": "^4.17.21",
+        "marked": "^13.0.2",
+        "roughjs": "^4.6.6",
+        "stylis": "^4.3.1",
+        "ts-dedent": "^2.2.0",
+        "uuid": "^9.0.1"
+      }
+    },
     "node_modules/micromark-util-character": {
       "version": "2.1.1",
       "integrity": "sha512-wv8tdUTJ3thSFFFJKtpYKOYiGP2+v96Hvk4Tu8KpCAsTMs6yi+nVmGh1syvSCsaxz45J6Jbw+9DD6g97+NV67Q==",
@@ -4590,6 +5730,35 @@
         "url": "https://opencollective.com/express"
       }
     },
+    "node_modules/mlly": {
+      "version": "1.8.2",
+      "integrity": "sha512-d+ObxMQFmbt10sretNDytwt85VrbkhhUA/JBGm1MPaWJ65Cl4wOgLaB1NYvJSZ0Ef03MMEU/0xpPMXUIQ29UfA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "acorn": "^8.16.0",
+        "pathe": "^2.0.3",
+        "pkg-types": "^1.3.1",
+        "ufo": "^1.6.3"
+      }
+    },
+    "node_modules/mlly/node_modules/confbox": {
+      "version": "0.1.8",
+      "integrity": "sha512-RMtmw0iFkeR4YV+fUOSucriAQNb9g8zFR52MWCtl+cCZOFRNL6zeB395vPzFhEjjn4fMxXudmELnl/KF/WrK6w==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/mlly/node_modules/pkg-types": {
+      "version": "1.3.1",
+      "integrity": "sha512-/Jm5M4RvtBFVkKWRu2BLUTNP8/M2a+UwuAX+ae4770q1qVGtfjG+WTCupoZixokjmHiry8uI+dlY8KXYV5HVVQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "confbox": "^0.1.8",
+        "mlly": "^1.7.4",
+        "pathe": "^2.0.1"
+      }
+    },
     "node_modules/mrmime": {
       "version": "2.0.1",
       "integrity": "sha512-Y3wQdFg2Va6etvQ5I82yUhGdsKrcYox6p7FfL1LbK2J4V01F9TGlepTIhnK24t7koZibmg82KGglhA1XK5IsLQ==",
@@ -4847,6 +6016,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/path-data-parser": {
+      "version": "0.1.0",
+      "integrity": "sha512-NOnmBpt5Y2RWbuv0LMzsayp3lVylAHLPUTut412ZA3l+C4uw4ZVkQbjShYCQ8TCpUMdPapr4YjUqLYD6v68j+w==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/path-to-regexp": {
       "version": "8.4.2",
       "integrity": "sha512-qRcuIdP69NPm4qbACK+aDogI5CBDMi1jKe0ry5rSQJz8JVLsC7jV8XpiJjGRLLol3N+R5ihGYcrPLTno6pAdBA==",
@@ -4857,6 +6032,12 @@
         "url": "https://opencollective.com/express"
       }
     },
+    "node_modules/pathe": {
+      "version": "2.0.3",
+      "integrity": "sha512-WUjGcAqP1gQacoQe+OBJsFA7Ld4DyXuUIjZ5cc75cLHvJ7dtNsTugphxIADwspS+AraAUePCKrSVtPLFj/F88w==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/piccolore": {
       "version": "0.1.3",
       "integrity": "sha512-o8bTeDWjE086iwKrROaDf31K0qC/BENdm15/uH9usSC/uZjJOKb2YGiVHfLY4GhwsERiPI1jmwI2XrA7ACOxVw==",
@@ -4880,6 +6061,17 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
+    "node_modules/pkg-types": {
+      "version": "2.3.3",
+      "integrity": "sha512-j/lCFdcppV0JxWpCEITdbDltBxPP6cHT+yNJ6Go2OgoSA9518X847X9z0p6LtA4Nc16+eQzCZjRrWanTGvHJ5w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "confbox": "^0.3.1",
+        "exsolve": "^1.1.1",
+        "pathe": "^2.0.3"
+      }
+    },
     "node_modules/playwright": {
       "version": "1.62.1",
       "integrity": "sha512-0M+L3LAD8/nm554LOla9Ayx0j0tmFZ0FBcoQ7F1VuVHpM/XpiC8RcDzBQB8W5+hA8L22THxELzeF+2WcUzvcLg==",
@@ -4910,6 +6102,22 @@
         "node": ">=20"
       }
     },
+    "node_modules/points-on-curve": {
+      "version": "0.2.0",
+      "integrity": "sha512-0mYKnYYe9ZcqMCWhUjItv/oHjvgEsfKvnUTg8sAtnHr3GVy7rGkXCb6d5cSyqrWqL4k81b9CPg3urd+T7aop3A==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/points-on-path": {
+      "version": "0.2.1",
+      "integrity": "sha512-25ClnWWuw7JbWZcgqY/gJ4FQWadKxGWk+3kR/7kD0tCaDtPPMj7oHu2ToLaVhfpnHrZzYby2w6tUA0eOIuUg8g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "path-data-parser": "0.1.0",
+        "points-on-curve": "0.2.0"
+      }
+    },
     "node_modules/postcss": {
       "version": "8.5.28",
       "integrity": "sha512-RRuzqDtt5Y9h3quz5hWhK+TPnsmVs6WwSU6LkJMeY4HstUEDuYTG8UJSdawMRzmzAtV+KEoG8N3Qg2qLy5vM/A==",
@@ -5009,6 +6217,22 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/quansync": {
+      "version": "0.2.11",
+      "integrity": "sha512-AifT7QEbW9Nri4tAwR5M/uzpBuqfZf+zwaEM/QkzEjj7NBuFD2rBuy0K3dE+8wltbezDV7JMA0WfnCPYRSYbXA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/antfu"
+        },
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/sxzz"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/radix3": {
       "version": "1.1.2",
       "integrity": "sha512-b484I/7b8rDEdSDKckSSBA8knMpcdsXudlE/LNL639wFoHKwLbEkQFZHWEYwDC0wa0FKUcCY+GAF73Z7wxNVFA==",
@@ -5118,6 +6342,12 @@
         "url": "https://opencollective.com/unified"
       }
     },
+    "node_modules/robust-predicates": {
+      "version": "3.0.3",
+      "integrity": "sha512-NS3levdsRIUOmiJ8FZWCP7LG3QpJyrs/TE0Zpf1yvZu8cAJJ6QMW92H1c7kWpdIHo8RvmLxN/o2JXTKHp74lUA==",
+      "dev": true,
+      "license": "Unlicense"
+    },
     "node_modules/rolldown": {
       "version": "1.2.1",
       "integrity": "sha512-4FKJhg8d3OiyQOA6Q1Q0hoFFpW9/OoX+VsHzpECsdsIZoOArrAK90gl59YK/Z+gnDel45bgJZK03ozH/9bCqEw==",
@@ -5151,6 +6381,18 @@
         "@rolldown/binding-win32-x64-msvc": "1.2.1"
       }
     },
+    "node_modules/roughjs": {
+      "version": "4.6.6",
+      "integrity": "sha512-ZUz/69+SYpFN/g/lUlo2FXcIjRkSu3nDarreVdGGndHEBJ6cXPdKguS8JGxwj5HA5xIbVKSmLgr5b3AWxtRfvQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "hachure-fill": "^0.5.2",
+        "path-data-parser": "^0.1.0",
+        "points-on-curve": "^0.2.0",
+        "points-on-path": "^0.2.1"
+      }
+    },
     "node_modules/router": {
       "version": "2.2.0",
       "integrity": "sha512-nLTrUKm2UyiL7rlhapu/Zl45FwNgkZGaCpZbIHajDYgwlJCOzLSk+cIPAnsEqV955GjILJnKbdQC1nVPz+gAYQ==",
@@ -5167,6 +6409,12 @@
         "node": ">= 18"
       }
     },
+    "node_modules/rw": {
+      "version": "1.3.3",
+      "integrity": "sha512-PdhdWy89SiZogBLaw42zdeqtRJ//zFd2PgQavcICDUgJT5oW10QCRKbJ6bg4r0/UY2M6BWd5tkxuGFRvCkgfHQ==",
+      "dev": true,
+      "license": "BSD-3-Clause"
+    },
     "node_modules/safer-buffer": {
       "version": "2.1.2",
       "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
@@ -5499,6 +6747,12 @@
         "url": "https://github.com/chalk/strip-ansi?sponsor=1"
       }
     },
+    "node_modules/stylis": {
+      "version": "4.4.0",
+      "integrity": "sha512-5Z9ZpRzfuH6l/UAvCPAPUo3665Nk2wLaZU3x+TLHKVzIz33+sbJqbtrYoC3KD4/uVOr2Zp+L0LySezP9OHV9yA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/svgo": {
       "version": "4.0.2",
       "integrity": "sha512-ekx94z1rRc5LDi6oSUaeRnYhd0UOJxdtQCL2rF8xpWxD3TPAsISWOrxezqGovqS38GRZOdpDfvQe3ts6F7nsng==",
@@ -5612,6 +6866,15 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/ts-dedent": {
+      "version": "2.3.0",
+      "integrity": "sha512-JfJeIHke7y2egdGGgRAvpCwYFUsHlM2gPcrVOxFkznt/4uzQ7HFmvE63iFHVLBJNDuyDOQgijDK/tXH/f6Msjg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.10"
+      }
+    },
     "node_modules/tslib": {
       "version": "2.8.1",
       "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
@@ -5905,6 +7168,20 @@
         }
       }
     },
+    "node_modules/uuid": {
+      "version": "9.0.1",
+      "integrity": "sha512-b+1eJOlsR9K8HJpow9Ok3fiWOWSIcIzXodvv0rQjVoOVNpWMpxf1wZNpt4y9h10odCNrqnYp1OBzRktckBe3sA==",
+      "deprecated": "uuid@10 and below is no longer supported.  For ESM codebases, update to uuid@latest.  For CommonJS codebases, use uuid@11 (but be aware this version will likely be deprecated in 2028).",
+      "dev": true,
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/bin/uuid"
+      }
+    },
     "node_modules/vary": {
       "version": "1.1.2",
       "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
diff --git a/package.json b/package.json
index 43802c2..b2a85d0 100644
--- a/package.json
+++ b/package.json
@@ -42,6 +42,7 @@
     "astro": "^7.0.4",
     "chokidar": "^5.0.0",
     "express": "^5.2.1",
+    "mermaid": "11.4.1",
     "tailwindcss": "^4.0.0",
     "typescript": "^6.0.3",
     "web-fragments": "^0.8.2"
diff --git a/scripts/setup-test-apps.mjs b/scripts/setup-test-apps.mjs
index ec09727..c210649 100644
--- a/scripts/setup-test-apps.mjs
+++ b/scripts/setup-test-apps.mjs
@@ -25,7 +25,8 @@
  * kb-docs.tar.gz / an unpacked artifact directory.
  */
 
-import { mkdirSync, rmSync, writeFileSync, existsSync } from 'node:fs';
+import { copyFileSync, mkdirSync, rmSync, writeFileSync, existsSync } from 'node:fs';
+import { createRequire } from 'node:module';
 import { dirname, join, resolve, isAbsolute } from 'node:path';
 import { fileURLToPath } from 'node:url';
 
@@ -53,8 +54,10 @@ if (!existsSync(artifactAbs)) {
 //
 // Written as an *unpacked* bundle directory (apps.json `prebuilt` accepts either
 // a tarball or a directory), so it stays reviewable in git instead of being an
-// opaque blob. It is regenerated here on every run and committed, so CI's plain
-// `npm run build:headless` works without running this script first.
+// opaque blob. It is regenerated here on every run and committed — all but the
+// vendored mermaid bundle, which is copied from node_modules and gitignored, so
+// a build that should render diagrams runs this script first (CI's build job
+// does).
 //
 // The document shell comes from the real action (actions/publish-single-page-docs/src/
 // template.js — deliberately dependency-free) so the fixture cannot drift from
@@ -105,16 +108,14 @@ const RELEASE_PROCESS_BODY = `<h1 id="release-process" tabindex="-1">Release Pro
 </ol>`;
 
 /**
- * Stand-in for the vendored mermaid bundle.
- *
- * The real action copies mermaid's 2.5 MB UMD build into each doc that needs it;
- * committing that to the fixture would bloat the repo for no test value. What the
- * suite actually needs is that the reference resolves (no 404 while browsing) and
- * that the diagram source survives the build.
+ * The mermaid bundle the action vendors — the real one, so the suites can
+ * assert a diagram actually renders inside the fragment rather than only that
+ * the script reference resolves. Pinned in the root package.json to the
+ * version actions/package.json pins (tests/artifact-checks.spec.js keeps them
+ * equal). Copied here on every run and gitignored: 2.5 MB of minified JS is
+ * not worth committing when node_modules already has it.
  */
-const MERMAID_STUB = `/* Test fixture stand-in for the vendored mermaid bundle. */
-window.mermaid = { initialize: function () {}, run: function () {} };
-`;
+const MERMAID_BUNDLE = createRequire(import.meta.url).resolve('mermaid/dist/mermaid.min.js');
 
 /**
  * Regression fixture for #49 — a stylesheet two directories deep that references
@@ -175,7 +176,7 @@ function writeSinglePageBundle() {
     writeFileSync(join(docDir, CSS_PATH), DOC_CSS);
     if (doc.depthFixture) writeFileSync(join(docDir, dirname(CSS_PATH), 'depth-check.css'), DEPTH_CHECK_CSS);
     if (doc.usesMermaid) {
-      writeFileSync(join(docDir, MERMAID_PATH), MERMAID_STUB);
+      copyFileSync(MERMAID_BUNDLE, join(docDir, MERMAID_PATH));
       // Real init script, not a stub: it is the thing that must stay out of the
       // HTML for the knowledge base's script-src 'self' to hold, so the fixture
       // ships it exactly as the action does.
diff --git a/src/layouts/Base.astro b/src/layouts/Base.astro
index b7b540f..5a26d2e 100644
--- a/src/layouts/Base.astro
+++ b/src/layouts/Base.astro
@@ -101,7 +101,11 @@ const bodyClasses = [
       and a runtime that parses this block before the <head> would then order
       the sub-app layer above the fence. */}
   <style is:inline data-kb-stylesheet set:html={LAYER_ORDER + '\n' + kbStylesheet}></style>
-  <slot />
+  {/* The design tokens the fragment's shadow tree reads, likewise ahead of the
+      content: a blocking <script src> in a sub-app body (a vendored mermaid
+      bundle is 2.5 MB) holds the parser, and until it reaches this block an
+      embedded page renders with no tokens — black text, no theme. */}
   <Fragment set:html={shadowCompatStyle} />
+  <slot />
 </body>
 </html>
diff --git a/src/scripts/embedded-transitions.js b/src/scripts/embedded-transitions.js
index d1ccf9e..8821df9 100644
--- a/src/scripts/embedded-transitions.js
+++ b/src/scripts/embedded-transitions.js
@@ -144,6 +144,31 @@ function dropPortalSnapshots() {
   if (adopted.some(isSnapshot)) document.adoptedStyleSheets = adopted.filter((s) => !isSnapshot(s));
 }
 
+/**
+ * A copy of `el` owned by the host document, so its nodes belong to the host
+ * window's realm.
+ *
+ * reframed runs a fragment script in its iframe only when the script reaches
+ * the fragment's DOM through a host-realm insertion method — it patches the
+ * host window's Node/Element prototypes and nothing else. The page the router
+ * fetched was parsed in the iframe, so its nodes are iframe-realm. After the
+ * swap, Astro re-runs each new script with `script.replaceWith(fresh)`; on an
+ * iframe-realm `script` that is the iframe's unpatched replaceWith, and the
+ * fresh script executes in the HOST window: a mermaid bundle defined
+ * `window.mermaid` on the host page, and the diagram stayed source text.
+ * Scripts keep their `data-astro-exec` marks through the copy, so what is
+ * already running is not run twice.
+ */
+function adoptIntoHost(el) {
+  let hostDoc;
+  try {
+    hostDoc = window.parent.document;
+  } catch {
+    return el;
+  }
+  return hostDoc && hostDoc !== document ? hostDoc.importNode(el, true) : el;
+}
+
 document.addEventListener('astro:before-swap', (event) => {
   dropPortalSnapshots();
   const newDoc = event.newDocument;
@@ -165,10 +190,12 @@ document.addEventListener('astro:before-swap', (event) => {
 
   event.swap = () => {
     swapFunctions.deselectScripts(newDoc);
+    const head = adoptIntoHost(next.head);
+    const body = adoptIntoHost(next.body);
     swapRootAttributes(current.root, next.root);
-    swapHead(current.head, next.head);
+    swapHead(current.head, head);
     const restoreFocus = swapFunctions.saveFocus();
-    swapFunctions.swapBodyElement(next.body, current.body);
+    swapFunctions.swapBodyElement(body, current.body);
     restoreFocus();
   };
 });
diff --git a/tests/artifact-checks.spec.js b/tests/artifact-checks.spec.js
index a0c0f47..9eeb405 100644
--- a/tests/artifact-checks.spec.js
+++ b/tests/artifact-checks.spec.js
@@ -50,6 +50,15 @@ test.describe('the build and the action parse the same way', () => {
       expect(root[name], `package.json must pin ${name} exactly as actions/ does`).toBe(actions[name]);
     }
   });
+
+  // scripts/setup-test-apps.mjs vendors the root copy into the single-page
+  // fixture, standing in for the one the action vendors into published docs.
+  test('the fixture mermaid bundle is the version the action vendors', () => {
+    const root = pkg('package.json').devDependencies.mermaid;
+    const actions = pkg('actions/package.json').dependencies.mermaid;
+    expect(actions, 'actions/package.json must pin mermaid').toMatch(/^\d+\.\d+\.\d+$/);
+    expect(root, 'package.json must pin mermaid exactly as actions/ does').toBe(actions);
+  });
 });
 
 test.describe('reporting an artifact', () => {
diff --git a/tests/container.spec.js b/tests/container.spec.js
index 9f353a0..1e17735 100644
--- a/tests/container.spec.js
+++ b/tests/container.spec.js
@@ -221,6 +221,15 @@ test.describe('CSP in a browser', () => {
     });
   }
 
+  // The fixture ships the real mermaid bundle the action vendors; a diagram
+  // that stays source text is the silent failure this policy could cause.
+  test('a mermaid diagram renders to SVG under the policy', async ({ page }) => {
+    await page.goto('/knowledge-base/platform-overview/');
+    const diagram = page.locator('main.kb-single-page pre.mermaid').first();
+    await expect(diagram.locator('svg')).toBeVisible({ timeout: 15_000 });
+    await expect(diagram).not.toContainText('flowchart LR');
+  });
+
   test('the hoisted sub-app scripts actually execute under the policy', async ({ page }) => {
     const blocked = [];
     page.on('response', (res) => {
diff --git a/tests/fixtures/single-page-bundle/platform-overview/assets/mermaid.min.js b/tests/fixtures/single-page-bundle/platform-overview/assets/mermaid.min.js
deleted file mode 100644
index 84051bd..0000000
--- a/tests/fixtures/single-page-bundle/platform-overview/assets/mermaid.min.js
+++ /dev/null
@@ -1,2 +0,0 @@
-/* Test fixture stand-in for the vendored mermaid bundle. */
-window.mermaid = { initialize: function () {}, run: function () {} };
diff --git a/tests/web-fragment.spec.js b/tests/web-fragment.spec.js
index a1f6969..816758c 100644
--- a/tests/web-fragment.spec.js
+++ b/tests/web-fragment.spec.js
@@ -16,7 +16,7 @@
 import { test, expect } from '@playwright/test';
 import {
   gotoFragment, waitForFragmentText, hostStillAlive,
-  queryInShadow, getFragmentText, shadowHrefs, fragmentIsDark,
+  queryInShadow, getFragmentText, shadowHrefs, fragmentIsDark, fragmentFrame,
 } from './support/fragment.js';
 
 /** Attach a collector of same-origin (host) responses with status >= 400. */
@@ -225,6 +225,89 @@ test.describe('Single-page docs', () => {
   });
 });
 
+// ─────────────────────────────────────────────────────────────────────────────
+// Mermaid diagrams. The platform-overview fixture ships the real mermaid bundle
+// the action vendors, so these fail if the bundle or its init file is missing,
+// errors, or leaves the diagram source on the page.
+test.describe('Mermaid diagrams', () => {
+  const DIAGRAM = 'main.kb-single-page pre.mermaid';
+
+  /** Resolves once the fixture flowchart is an <svg> with its three nodes. */
+  async function expectRenderedDiagram(page) {
+    const diagram = page.locator(DIAGRAM).first();
+    await expect(diagram.locator('svg'), 'the flowchart was not rendered to SVG').toBeVisible({ timeout: 15_000 });
+    await expect(diagram.locator('svg .node')).toHaveCount(3);
+    await expect(diagram, 'mermaid source is still visible').not.toContainText('flowchart LR');
+    await expect(diagram).not.toContainText('-->');
+  }
+
+  /** Fails the test on any page or fragment-frame error thrown while it runs. */
+  function collectErrors(page) {
+    const errors = [];
+    page.on('pageerror', (e) => errors.push(String(e)));
+    page.on('console', (msg) => { if (msg.type() === 'error') errors.push(msg.text()); });
+    return errors;
+  }
+
+  test('renders on initial load, from the packaged bundle', async ({ page }) => {
+    const errors = collectErrors(page);
+    const assets = [];
+    page.on('response', (res) => {
+      if (/\/knowledge-base\/platform-overview\/assets\/mermaid(-init|\.min)\.js$/.test(res.url())) {
+        assets.push(`${res.status()} ${new URL(res.url()).pathname}`);
+      }
+    });
+
+    await gotoFragment(page, '/knowledge-base/platform-overview/');
+    await expectRenderedDiagram(page);
+
+    expect(assets.sort()).toEqual([
+      '200 /knowledge-base/platform-overview/assets/mermaid-init.js',
+      '200 /knowledge-base/platform-overview/assets/mermaid.min.js',
+    ]);
+    expect(errors, errors.join('\n')).toEqual([]);
+  });
+
+  test('renders after in-fragment navigation into the doc', async ({ page }) => {
+    const errors = collectErrors(page);
+    await gotoFragment(page, '/knowledge-base/');
+    await clickFragmentLink(page, '.kb-card[href="/knowledge-base/platform-overview/"]');
+    await waitForFragmentText(page, /Request flow/i);
+
+    await expectRenderedDiagram(page);
+    expect(await hostStillAlive(page)).toBe(true);
+    expect(errors, errors.join('\n')).toEqual([]);
+  });
+
+  // The failure behind the diagram: a script the ClientRouter swapped in ran
+  // in the host window, not in reframed's iframe (see adoptIntoHost() in
+  // src/scripts/embedded-transitions.js). A sub-app global on the host page is
+  // the leak itself, whether or not anything then fails to render.
+  test('scripts swapped in by the router run in the fragment, never in the host window', async ({ page }) => {
+    await gotoFragment(page, '/knowledge-base/');
+    await clickFragmentLink(page, '.kb-card[href="/knowledge-base/platform-overview/"]');
+    await expectRenderedDiagram(page);
+
+    expect(await page.evaluate(() => typeof window.mermaid), 'mermaid leaked onto the host window').toBe('undefined');
+    expect(await fragmentFrame(page).evaluate(() => typeof window.mermaid)).toBe('object');
+  });
+
+  test('renders again after navigating away and back', async ({ page }) => {
+    const errors = collectErrors(page);
+    await gotoFragment(page, '/knowledge-base/platform-overview/');
+    await expectRenderedDiagram(page);
+
+    await clickFragmentLink(page, '#kb-masthead a[href="/knowledge-base/"]');
+    await waitForFragmentText(page, /Release Process/i);
+    await clickFragmentLink(page, '.kb-card[href="/knowledge-base/platform-overview/"]');
+    await waitForFragmentText(page, /Request flow/i);
+
+    await expectRenderedDiagram(page);
+    expect(await hostStillAlive(page)).toBe(true);
+    expect(errors, errors.join('\n')).toEqual([]);
+  });
+});
+
 // ─────────────────────────────────────────────────────────────────────────────
 test.describe('Asset loading on the host origin', () => {
   test('no 404s for fragment assets while browsing', async ({ page }) => {
diff --git a/tsconfig.json b/tsconfig.json
index 700a5dd..4b069b0 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,5 +2,6 @@
   "extends": "astro/tsconfigs/strict",
   "compilerOptions": {
     "types": ["node"]
-  }
+  },
+  "exclude": ["dist", "tmp", "apps", "public", "tests/fixtures", "actions/node_modules"]
 }