perf(root-search): precompile command scoring fields

[JustYannicc]

What changed

• Added precompiled root-search query/field scoring primitives so normalized text, compact text, tokens, and camel initials are computed once and reused.
• Added a reusable root command score index that preserves rankCommands' existing score/order contract while exposing indexed match metadata for root command candidates.
• Memoized the command score index in useLauncherCommandModel for active root command search, recomputing when the searchable command snapshot or aliases change.
• Added scripts/test-root-search-perf.mjs to assert exact root command signatures and report legacy, compatibility-wrapper, indexed, and compile timings.

Why

Root command ranking was rebuilding scoring fields and normalized forms for every command on every query. The indexed path moves that work to a command/alias snapshot compile step and keeps per-keystroke ranking focused on the query and precompiled field data.

Compatibility impact

• rankCommands(commands, query, aliases) still returns the public { command, score } shape and preserves the existing ranking weights, alias exact sorting, always-on-top handling, and title tie-breaks.
• The new indexed path reuses the same command values and second-pass root scoring weights that useLauncherCommandModel already used for matchKind and matchScore.
• The perf harness asserts the indexed result signatures match the existing two-pass command path for all measured queries.

How tested

• node scripts/test-root-search-ranking.mjs ✅
• node scripts/test-root-search-perf.mjs ✅
  • Before implementation on this worker branch: optimized command scoring path median 1567.54ms for 6000 commands / 8 queries.
  • After on this clean PR branch: indexed command scoring path median 105.51ms, index compile median 77.94ms.
  • Clean PR harness also reported legacy median 2357.29ms, compatibility-wrapper median 936.64ms, and legacy-vs-indexed speedup 22.34x.
• git diff --check ✅
• ./node_modules/.bin/tsc -p tsconfig.renderer.json --noEmit --pretty false ❌ existing renderer typecheck failures on origin/main remain outside this change, including existing errors in App.tsx, CameraExtension.tsx, LiquidGlassSurface.tsx, browser profile typing in useLauncherCommandModel.ts, and several Raycast runtime/settings files.

Stack validation

• Clean PR branch is based on origin/main (9bdd3d2).
• Not stacked on unmerged performance consolidation PRs perf(runtime): reduce extension and menubar churn #530-perf(search): reduce indexing and ranking overhead #535.

[JustYannicc]

Superseded by #535. The root command score index work from this draft is now folded into JustYannicc:codex/consolidate-search-indexing, and #535's body includes the #557 validation and performance evidence. Closing this draft so the search/root scoring cleanup stays in the consolidated upstream PR.