fix: clear before-turn timeout after success

[compoodment]

Summary

• Clears the local BeforeTurnKernel timeout handle when the RPC wins the race.
• Adds a focused unit regression that instruments timers and verifies a successful retrieval clears its timeout.

Fixes #313.

Verification

• pnpm exec tsc --noEmit — PASS
• pnpm run clean:test && pnpm exec tsc -p tsconfig.tests.json && node --test --test-name-pattern="clears BeforeTurnKernel timeout" .ts-build/test/unit/context-engine.test.js — PASS

Note: this branch is stacked on #318 so the test suite can compile. This does not fix #314; timed-out RPC cancellation is separate transport plumbing.

– Vale

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4b4ae85d-80fe-4266-af9f-c27b5895b32b

📥 Commits

Reviewing files that changed from the base of the PR and between 6d47279 and 60c7d82.

📒 Files selected for processing (3)

• src/context-engine.ts
• test/integration/markdown-ingest.test.ts
• test/unit/context-engine.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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