feat(sync): persist local prompt workspaces

[ctawiah]

Context

Prompt sync needs a local representation that is easy to review in Git and safe to replace when LaunchDarkly is selected as the source of truth. This layer adds prompt wrapper parsing, rendering, and transactional file mutations on top of the manifest and reference contracts.

What changes

• Compiles prompt wrappers under .launchdarkly/<project>/configs/<config>/.
• Supports agent instructions, ordered completion messages, and repository-relative references.
• Creates, replaces, and deletes wrapper files atomically.
• Rolls back batch writes when a mutation fails.
• Preserves external referenced prompts when wrappers are deleted.

.launchdarkly/production/configs/support/default.prompt.md

Review focus

• Are paths and front matter validated before any file changes?
• Do batch operations avoid partial local state?
• Are referenced source files preserved correctly?

Verification

• go test ./internal/sync/...
• git diff --check

Related changes

Review the stack in this order:

1. Sync foundations
2. Prompt reference workspaces
3. Prompt sync manifests
4. Local prompt workspaces
5. Bootstrap prompt workspaces
6. Link and detach prompt resources
7. Prompt reconciliation
8. Prompt sync orchestration
9. Prompt sync command

---

Note

Overview
Adds internal/sync/local to read and write prompt variations under .launchdarkly/<project>/configs/<config>/*.prompt.md, turning YAML front matter plus inline or referenced prompt bodies into SyncedResource values for reconciliation.

Compile walks project trees (with path-aware parse errors); Store supports bootstrap, add (create-only via hard link), replace, and delete with batch preflight, staging, rollback, and “changed while syncing” checks. Linked prompts use repository-relative ref paths with symlink re-validation on read; Replace can update external sources when the adapter can render them.

Shared NormalizePromptText (line endings + trim) is used in fingerprints, local render/parse, and plain-markdown adapters so server and on-disk prompts fingerprint consistently.

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Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

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Create path skips durability Sync

Medium Severity

createFile writes and closes the temp file, then publishes it with os.Link, without Sync(). Bootstrap then treats the directory rename as the commit point. A crash after that rename can leave already-published wrappers with empty or partial contents. stageReplacement already flushes before its commit.

Additional Locations (1)

• internal/sync/local/store.go#L120-L131

 

^{Triggered by learned rule: Atomic sync writes: rename is the commit point}

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