feat(io): open-time breakdown log
Phase 5.2. Time each open phase — parse, purge, derived-cache build on the loader thread, plus xref resolve on the UI thread — and emit a breakdown line on open completion: parse 1240ms · purge 80ms · caches 340ms · xref 60ms · total 1820ms Makes open-time regressions (and the wins from 1.1 / 2.4) visible at a glance. Timings ride back on DerivedCaches; total is wall time from the Open click to post-xref. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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@ -241,7 +241,7 @@ Don't start any of the above **without measuring first**.
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Gate behind `debug_assertions` or a `--features profile` flag.
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### 5.2 Open-time breakdown log
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### 5.2 Open-time breakdown log ✅ DONE
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When open completes, push to the command line:
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