Implement notification rules engine API

[Dimwiddle]

Summary

• implement rule CRUD, condition evaluation, channel dispatch, and dispatch record persistence for the notification rules engine
• add SpecLeft-driven specs and tests covering acceptance scenarios and edge cases
• make event publishing non-blocking while recording channel outcomes

Testing

• .venv/bin/python -m pytest
• specleft status --format json

[Dimwiddle]

Retrospective

• Failed test runs before all tests passed: 1
• Time spent:
  • Spec externalisation: ~20 min
  • Implementation: ~40 min
  • Testing: ~15 min
  • Behaviour verification: ~10 min
• Clarity of project scope (grade):
  • Spec externalisation: B
  • Implementation: B+
  • Testing: A-
  • Behaviour verification: B
• What went well: SpecLeft spec/test flow mapped cleanly to PRD scenarios; FastAPI/SQLAlchemy layering kept responsibilities clear.
• What was missed or inefficient: initial background dispatch used threads with sqlite teardown edge case; needed a test-fixture adjustment to avoid race/teardown errors.
• Improvements: add explicit async task orchestration (or background task harness) and a dedicated integration test for teardown/dispatch lifecycle to catch thread/session cleanup earlier.

Usage

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