diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3d7d730..2a22135 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,7 +1,13 @@
 name: CI
 
 on:
-  pull_request:
+  # Push to main, non-draft pull requests and the weekly schedule run this through
+  # pipeline.yml (`workflow_call`), in parallel with the other checks and behind its `gate` job.
+  workflow_call:
+    secrets:
+      CODECOV_TOKEN:
+        required: false
+  workflow_dispatch:
 
 permissions:
   actions: read
@@ -9,7 +15,7 @@ permissions:
   pull-requests: write
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
+  group: ci-${{ github.ref }}
   cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 jobs:
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
new file mode 100644
index 0000000..6d5de97
--- /dev/null
+++ b/.github/workflows/codeql.yml
@@ -0,0 +1,37 @@
+# CodeQL code scanning for every language in the repo that supports `build-mode: none`;
+# results land in the Security tab. Repo default setup must stay off —
+# GitHub rejects advanced-workflow uploads while it is on.
+name: codeql
+
+on:
+  # Push to main, non-draft pull requests and the weekly schedule run this through
+  # pipeline.yml (`workflow_call`), in parallel with the other checks and behind its `gate` job.
+  workflow_call:
+  workflow_dispatch:
+
+jobs:
+  analyze:
+    if: github.event_name != 'pull_request' || !github.event.pull_request.draft
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      contents: read
+      actions: read
+    strategy:
+      fail-fast: false
+      matrix:
+        # `build-mode: none` for all: every language is extracted from source, so no build runs here.
+        # Not scanned: swift (no `build-mode: none` support), java-kotlin (Kotlin only, and
+        # none mode extracts Java only), ruby (only a CocoaPods Podfile, no Ruby sources), python
+        # (only vendored WAMR test scripts).
+        language: [actions, c-cpp, javascript-typescript, rust]
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: github/codeql-action/init@2892aa5e19bbd11bc0cff5427e3b750a04d9e3c2 # v4.38.2
+        with:
+          languages: ${{ matrix.language }}
+          build-mode: none
+          queries: security-and-quality
+      - uses: github/codeql-action/analyze@2892aa5e19bbd11bc0cff5427e3b750a04d9e3c2 # v4.38.2
+        with:
+          category: /language:${{ matrix.language }}
diff --git a/.github/workflows/pipeline.yml b/.github/workflows/pipeline.yml
new file mode 100644
index 0000000..63cad6c
--- /dev/null
+++ b/.github/workflows/pipeline.yml
@@ -0,0 +1,89 @@
+# Gated pipeline. ci, codeql, semgrep and snyk run in parallel as reusable workflows; `gate`
+# passes only when all four succeeded. Anything downstream (deploy, release, publish) must
+# `needs: gate`. Draft pull requests skip every job, the gate included, until marked ready.
+# Secrets are passed explicitly (no `secrets: inherit`): each child gets only what it uses.
+name: pipeline
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+    types: [opened, synchronize, reopened, ready_for_review]
+  schedule:
+    - cron: "17 4 * * 1"
+  workflow_dispatch:
+
+concurrency:
+  group: pipeline-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+permissions:
+  contents: read
+
+jobs:
+  ci:
+    if: github.event_name != 'pull_request' || !github.event.pull_request.draft
+    uses: ./.github/workflows/ci.yml
+    secrets:
+      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+    # ci.yml's jobs request these (e.g. revert-on-failure); a called workflow cannot exceed them.
+    permissions:
+      actions: read
+      contents: read
+      pull-requests: write
+
+  codeql:
+    if: github.event_name != 'pull_request' || !github.event.pull_request.draft
+    uses: ./.github/workflows/codeql.yml
+    permissions:
+      security-events: write
+      contents: read
+      actions: read
+
+  semgrep:
+    if: github.event_name != 'pull_request' || !github.event.pull_request.draft
+    uses: ./.github/workflows/semgrep.yml
+    permissions:
+      security-events: write
+      contents: read
+      actions: read
+
+  snyk:
+    if: github.event_name != 'pull_request' || !github.event.pull_request.draft
+    uses: ./.github/workflows/snyk.yml
+    secrets:
+      SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
+    permissions:
+      security-events: write
+      contents: read
+      actions: read
+
+  gate:
+    needs: [ci, codeql, semgrep, snyk]
+    # !cancelled(): run even when a need failed, was cancelled or skipped, so the gate reports it,
+    # but not when the whole run is cancelled (always() would hold the run and its concurrency
+    # group until a runner picks up the gate). Skipped on draft PRs like every other job, so a
+    # draft run never leaves a green `gate` check behind.
+    if: ${{ !cancelled() && (github.event_name != 'pull_request' || !github.event.pull_request.draft) }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Require every job to succeed
+        env:
+          R_CI: ${{ needs.ci.result }}
+          R_CODEQL: ${{ needs.codeql.result }}
+          R_SEMGREP: ${{ needs.semgrep.result }}
+          R_SNYK: ${{ needs.snyk.result }}
+        run: |
+          # Only `success` passes: failure, cancelled and skipped all fail the gate.
+          fail=0
+          for pair in "ci=$R_CI" "codeql=$R_CODEQL" "semgrep=$R_SEMGREP" "snyk=$R_SNYK"; do
+            name=${pair%%=*}
+            result=${pair#*=}
+            echo "$name: $result"
+            if [ "$result" != "success" ]; then
+              echo "::error title=gate::$name finished with '$result'"
+              fail=1
+            fi
+          done
+          exit "$fail"
diff --git a/.github/workflows/semgrep.yml b/.github/workflows/semgrep.yml
new file mode 100644
index 0000000..55e4ccb
--- /dev/null
+++ b/.github/workflows/semgrep.yml
@@ -0,0 +1,32 @@
+# Semgrep static analysis with the free open-source CLI and the community `p/default` registry
+# ruleset (no Semgrep account or token). Results land in the Security tab (Code scanning,
+# category `semgrep`). Findings never fail the job, so this workflow does not block CI.
+name: semgrep
+
+on:
+  # Push to main, non-draft pull requests and the weekly schedule run this through
+  # pipeline.yml (`workflow_call`), in parallel with the other checks and behind its `gate` job.
+  workflow_call:
+  workflow_dispatch:
+
+jobs:
+  scan:
+    if: github.event_name != 'pull_request' || !github.event.pull_request.draft
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      contents: read
+      actions: read
+    container:
+      # semgrep/semgrep:1.177.0
+      image: semgrep/semgrep@sha256:acaac22ffc7b7cc5926de0751b223bce0b2491c33d18422fa72f632c78d81198
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      # No `--error`: findings are reported, not enforced. Metrics off since no account is used.
+      - name: Semgrep scan
+        run: semgrep scan --config p/default --sarif --output semgrep.sarif --metrics off
+      - uses: github/codeql-action/upload-sarif@2892aa5e19bbd11bc0cff5427e3b750a04d9e3c2 # v4.38.2
+        if: always()
+        with:
+          sarif_file: semgrep.sarif
+          category: semgrep
diff --git a/.github/workflows/snyk.yml b/.github/workflows/snyk.yml
new file mode 100644
index 0000000..d44be71
--- /dev/null
+++ b/.github/workflows/snyk.yml
@@ -0,0 +1,70 @@
+# Snyk Open Source dependency scan with the free Snyk CLI. Results land in the Security tab
+# (Code scanning, category `snyk`); findings never fail the job. Runs from pipeline.yml.
+#
+# Needs the repo secret SNYK_TOKEN. Without it every step is skipped with a notice and the job
+# succeeds, so the pipeline gate stays green until the token is added.
+#
+# Ecosystems in this repo: Cargo (Rust), pnpm/npm workspaces, Gradle Kotlin DSL (Android), Swift Package Manager (Package.resolved), CocoaPods (Podfile), pip (requirements.txt), Dockerfiles.
+# pnpm/npm, SwiftPM and Gradle are attempted; pip needs its packages installed and CocoaPods needs Podfile.lock, so those may show as unresolved. Dockerfiles are not scanned (`snyk container test` needs built images).
+# Rust/Cargo: Snyk documents that `snyk test` / `snyk monitor` do not support Cargo projects
+# (Rust is limited to `snyk sbom test` on a CycloneDX/SPDX SBOM, and API use needs a paid plan),
+# so `--all-projects` does not cover Cargo.lock here.
+name: snyk
+
+on:
+  workflow_call:
+    secrets:
+      SNYK_TOKEN:
+        required: false
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    if: github.event_name != 'pull_request' || !github.event.pull_request.draft
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      contents: read
+      actions: read
+    env:
+      SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
+    steps:
+      - name: Check for SNYK_TOKEN
+        id: token
+        run: |
+          if [ -z "$SNYK_TOKEN" ]; then
+            echo "::notice title=snyk skipped::SNYK_TOKEN secret is not set; Snyk scan skipped."
+            echo "present=false" >> "$GITHUB_OUTPUT"
+          else
+            echo "present=true" >> "$GITHUB_OUTPUT"
+          fi
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        if: steps.token.outputs.present == 'true'
+      - uses: snyk/actions/setup@9adf32b1121593767fc3c057af55b55db032dc04 # v1.0.0
+        if: steps.token.outputs.present == 'true'
+      # Exit 1 = vulnerabilities found (reported, not enforced); 2/3 = scan error or no
+      # supported manifest (warned, not enforced).
+      - name: Snyk test
+        if: steps.token.outputs.present == 'true'
+        run: |
+          code=0
+          snyk test --all-projects --sarif-file-output=snyk.sarif || code=$?
+          case "$code" in
+            0) ;;
+            1) echo "::notice title=snyk::Vulnerable dependencies found; see Security > Code scanning (category snyk)." ;;
+            *) echo "::warning title=snyk::snyk test exited $code (scan error or no supported project); not failing the job." ;;
+          esac
+      - name: Snyk monitor
+        if: steps.token.outputs.present == 'true' && github.event_name == 'push' && github.ref == 'refs/heads/main'
+        run: |
+          code=0
+          snyk monitor --all-projects || code=$?
+          if [ "$code" != 0 ]; then echo "::warning title=snyk::snyk monitor exited $code"; fi
+      - uses: github/codeql-action/upload-sarif@2892aa5e19bbd11bc0cff5427e3b750a04d9e3c2 # v4.38.2
+        if: steps.token.outputs.present == 'true' && hashFiles('snyk.sarif') != ''
+        with:
+          sarif_file: snyk.sarif
+          category: snyk