docs(touch): the touch system guide + measured cost model - #211
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The developer path through the touch pyramid — components (Focusable / TextField / VirtualList) over gesture algebra (createGesture / createScroller) over raw contacts — with the claim model, hit facts (why touchRect does not exist), modality degradation, the testing story, and the MEASURED cost table (counting-host over the real frame pump: idle 0 ops/frame, steady fling 1, window-churn bursts <=15 — 0.2% of the PSP op budget). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Phase 2, change C (after #209/#210):
docs/TOUCH.md— the get-started path a developer actually walks.Structure: the three-layer pyramid (stop as high as you can) → zero-import button →
TextField→VirtualList→createGesture(the ONE concept: claiming) →createScroller→ hit facts (whytouchRectdoesn't exist) → degradation table + the one legitimate branch → modality → journey/tape/golden testing → the measured cost table (idle 0 ops/frame, steady fling 1, churn ≤15 — 0.2% of the PSP budget) with the engine's structural complexity promises.🤖 Generated with Claude Code