[WIP] Update the DECOMPOSE_SYSTEM_PROMPT constant in packages/chat-api/src/lin

[bamdadd]

⚠️ This is a draft PR created by Lintel after a pipeline failure.
The automated workflow could not complete successfully. An engineer should review the changes, fix any issues, and mark the PR as ready.

Summary

Implement a notification system as a new lintel-notifications-api package following established monorepo patterns: domain contracts first, persistence store, FastAPI router with event publishing, read-model projection, app composition wiring, and full test coverage.

Changes

• Define domain contracts for notification system in packages/contracts/
• Implement notification persistence store in packages/persistence/
• Create notifications-api package with FastAPI router
• Add notification event publishing via event-bus and event-store
• Implement notification read-model projection in packages/projections/
• Mount notifications router and wire lifespan in packages/app/
• Write unit and integration tests for notifications-api
• Lint, typecheck, and documentation pass

Context

Update the DECOMPOSE_SYSTEM_PROMPT constant in packages/chat-api/src/lintel/chat_api/decomposer.py to include four explicit instruction sections: (1) sizing constraint — each work item must be implementable in a single PR touching max 3 files; (2) requirement traceability — every numbered point in the user input must map to at least one work item; (3) interface-first ordering — protocols and abstractions must appear before concrete implementations; (4) agent-readiness — descriptions must specify the target package, key files to create/modify, API routes, events to emit, and acceptance tests. Acceptance: the updated prompt is present in the file and a unit test asserts all four instruction keywords/phrases appear in the prompt string.

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Raised by Lintel 🤖

[bamdadd]

Closing stub PR from failed pipeline. Will retry with ingest fix.