feat(bd-2kf): Add comprehensive test coverage for parser and store
- Add 36 parser tests covering:
- parseLogLine with valid/invalid inputs
- parseLogLines for multi-line parsing
- formatEvent with all options
- Edge cases: malformed JSON, missing fields, colorization
- Add 35 store tests covering:
- InMemoryEventStore add/query operations
- Worker status tracking (active/idle/error)
- Event filtering by worker, level, bead, timestamp
- maxEvents limit and LRU trimming
- getStore/resetStore singleton management
- Close phase beads (bd-2pa, bd-n8l, bd-2nu) as infrastructure complete
- Close test beads (bd-5eh, bd-2en) with comprehensive coverage
- Total: 91 tests passing across parser, store, and tailer
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Co-Authored-By: Claude <noreply@anthropic.com>
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