perf: selective FileWatcher invalidation, expand ProjectTokenSummary tests#115
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KyleNesium merged 1 commit intomainfrom Mar 14, 2026
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…mmary tests - FileWatcher now invalidates only the relevant reader cache per event source: stats-cache changes → StatsCacheReader only, JSONL changes → SessionLogReader only. Fallback timer still invalidates both. Avoids unnecessary JSONL re-scans when only stats-cache changed. - ProjectTokenSummary tests expanded from 1 → 7: zero tokens, id as Identifiable, lastPathComponent display name, Other project for missing cwd, stored cost, large token counts (overflow guard). - DATA_LAYER.md updated to document selective invalidation.
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Summary
StatsCacheReader, JSONL watcher only invalidatesSessionLogReader. Avoids unnecessary JSONL re-scans when only stats-cache changed (and vice versa). Fallback timer still invalidates both as a safe catch-all.Test plan
swift test— all 7 ProjectTokenSummary tests pass