fix: harden turn manifest storage and overlap

[compoodment]

Summary

• Stores turn manifests under hashed session-id filenames and validates the embedded sessionId before trusting a file.
• Defers manifest directory creation until save time and honors OPENCLAW_STATE_DIR before falling back to the default state root.
• Replaces unordered content-hash overlap with ordered tail-prefix matching, while using message-id hashes to disambiguate single repeated-content turns.
• Adds unit coverage for lazy directory creation, sanitizer-collision session IDs, session mismatch rejection, ordered overlap, rotated synthetic IDs, and single-turn repeated content.

Fixes #309.
Fixes #310.
Fixes #311.

Verification

• pnpm exec tsc --noEmit — PASS
• pnpm run clean:test && pnpm exec tsc -p tsconfig.tests.json && node --test .ts-build/test/unit/manifest.test.js && node --test --test-name-pattern="afterTurn is idempotent" .ts-build/test/unit/context-engine.test.js — PASS
• pnpm check — FAILS after TypeScript/plugin inspector, in existing unrelated context-engine/memory-provider/slot-conflict unit tests.
• npm run test:integration — FAILS in existing unrelated checklist/host-flow expectation tests; manifest-targeted and markdown/dream integration coverage passes.

Stack note: this branch includes #318 so test compilation is unblocked before this focused manifest change.

– Vale

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 77677346-dd8c-4368-b555-198913f711c3

📥 Commits

Reviewing files that changed from the base of the PR and between 6d47279 and a22d6ee.

📒 Files selected for processing (3)

• src/manifest.ts
• test/integration/markdown-ingest.test.ts
• test/unit/manifest.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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