Instrument native and cooperative UI hot paths

[10-X-eng]

Summary

• reuse the existing Tracy integration to name document, Tree, Timeline, and Part view-provider hot paths
• reuse the existing Python performance recorder through one private, opt-in cooperative-scheduler hook with stable job identity
• preserve the disabled hot path: no timer, import, trace allocation, or file I/O, and one null check per cooperative slice
• make Tracy's existing shared-library default survive Tracy 0.11.1's CMake policy behavior
• record real Windows trace and exact packaged-runtime evidence in PERFORMANCE.md

This is a measurement slice in the system-wide performance program. It adds no worker, public API, preference, schema, or duplicate tracing framework.

Verification

• For code changes, a test failed before the implementation and passes afterward; for non-code changes, the PR explains why TDD does not apply.
• The PR lists the exact build and test commands and their results.

Red/green evidence:

• test_document_steps_emit_opt_in_gui_spans_with_operation_identity failed before the scheduler was connected to the existing recorder.
• test_domain_adapter_cooperatively_dispatches_each_publication_step failed with trace_attributes is None before VibeScript supplied stable operation identity.
• ..\..\.pixi\envs\default\python.exe -m pytest -q src\Mod\VibeCAD\vibecad_tests\test_cooperative_document_execution.py src\Mod\VibeCAD\vibecad_tests\test_performance.py src\Mod\VibeCAD\vibecad_tests\test_vibescript_publication_progress.py src\Mod\VibeCAD\vibecad_tests\test_native_background.py src\Mod\VibeCAD\vibecad_tests\test_native_analyze_solver_execution.py src\Mod\VibeCAD\vibecad_tests\test_native_drawing_view.py src\Mod\VibeCAD\vibecad_tests\test_native_registry.py — 86 passed in 8.24 seconds.
• pixi install -e default --frozen from package/rattler-build — Windows Release package succeeded in 17 minutes; 8,384 files, 489.45 MiB, vibecad-26.3.1RC6-h3c70cbc_1.conda.
• scripts/install_vibecad_provider_deps.sh .pixi/envs/default — completed; no broken requirements; provider, Aero, and keyring imports passed.
• Exact packaged GUI probe — VIBECAD_PERFORMANCE_TRACE_GUI_OK slices=4 heartbeat_samples=45, exit code 0.
• Full Tracy-enabled Windows Release build/install — succeeded. Clean configure produced TRACY_STATIC:BOOL=OFF and shared TracyClient.dll.
• Native 24-solid trace workload — completed; 231 KiB capture exported all named zones. Observed maxima are recorded in PERFORMANCE.md.
• git diff --check 99044673 — clean.

Compatibility

• Existing public functions/APIs still present and behaviorally compatible.
• No preference keys, tool names, or schema fields renamed or removed.
• Defaults preserve previous behavior; detailed tracing remains opt-in.
• No deprecations or breaking changes.

Issues

Tracks #167. This PR deliberately does not close the performance program; representative-scale optimization and proof remain open.

Risk and non-goals

Risk is limited to opt-in measurement code and Tracy linkage configuration. This PR does not claim benchmark completion, alter CAD behavior, or attempt an optimization before representative measurements exist.

[10-X-eng]

Closed at the repository owner request; this performance implementation is being discarded.