Task: Tests for quality monitoring system

Description

Write comprehensive tests for all quality monitoring modules: store, scorer, collector, detector, logger, and the quality-stats command. Tests use bun test following existing project patterns. Focus on unit tests for each module and one integration test for the full scoring pipeline.

Acceptance Criteria

• packages/opencode/test/quality/store.test.ts — SQLite CRUD, aggregation queries, retention cleanup, migration
• packages/opencode/test/quality/scorer.test.ts — sub-score computation, composite weighting, weight normalization, partial scoring, edge cases (all zeros, all 100s, missing LSP data)
• packages/opencode/test/quality/detector.test.ts — rolling average computation, severity classification, diagnostic reasoning generation, edge cases (< windowSize responses, first response)
• packages/opencode/test/quality/logger.test.ts — log level filtering, rotation trigger, file I/O error handling
• packages/opencode/test/quality/collector.test.ts — event subscription, signal aggregation, user feedback inference (revert, redo, edit-after-apply)
• packages/opencode/test/quality/integration.test.ts — full pipeline: event → collector → scorer → store → detector → logger
• All tests pass with bun test
• No regressions in existing test suite

Technical Details

• Use bun:test (describe, it, expect) following existing test patterns in packages/opencode/test/
• Use in-memory SQLite database (:memory:) for store tests — fast and isolated
• Mock event bus subscriptions for collector tests
• Mock file I/O for logger tests
• Integration test: create in-memory DB, simulate a sequence of scored responses, verify regression detection fires correctly
• Test edge cases: empty DB, single response, exactly windowSize responses, score of 0, score of 100

Dependencies

• All previous tasks (001-007) must be complete

Effort Estimate

• Size: L
• Hours: 8-10
• Parallel: false (depends on all other tasks)