perf: accelerate source scanning and split-pane editing - #6
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Small edits in long lines and split panes spent time rescanning unchanged text and restyling peer selections. Keep captured edits bounded, restore peer selection within the focus-aware styling scope, and scan unchanged UTF-16 spans in bulk. Compute document metadata in one UTF-8 pass and update the line index using only the edit and its CRLF boundary context.
Add regression coverage for Unicode/chunk boundaries, CRLF normalization and line-index seams, and unfocused peer selection. Tighten edit-pipeline performance budgets and assert that split-pane propagation neither rebuilds the peer pane nor publishes extra source revisions.
Local optimized-build p95 measurements (nine samples per workload):
Validation:
./scripts/verify.shpassed, including arm64 Debug/Release builds, lint, architecture checks and fixtures, vendor validation, 447 unit tests, 23 E2E tests, and 18 performance tests. Independent review completed after the CRLF boundary correction. Timings are local measurements, not cross-machine guarantees.Startup investigation is paused and excluded from this PR. Packaging, installation, signing, and distribution were not run.