feat(audit): meta-tooling duration analyzer (8 modules, 10-section renderer)
- scripts/audit/analyze_meta_tooling_durations.py (~700 lines) - tests/test_analyze_meta_tooling_durations.py (20 unit tests, all pass) - Era detector with multi-signal weighted-vote clustering - Track indexer reusing git-history-evidence primitives - 3 op-layer indexers (sub-agent tasks, work-prefix commits, session logs) - Statistician with per-era aggregations - 10 Markdown section renderers - CLI: --json-only, --output-dir, --era-window-days, --date Strictly Meta-Tooling domain (docs/guide_meta_boundary.md). Zero src/ changes; zero GUI changes; zero Application-domain impact. Part of conductor/tracks/meta_tooling_duration_analysis_20260705/.
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