Checkpoint web parity through Chromium input tasks

docs/status/M14-04C.md

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+# M14-04C Status
+
+status: done  
+task: Chromium mouse/touch/pen pointer identity and cancellation contract  
+updated: 2026-08-19 America/New_York  
+enablingTask: false  
+parityStateChange: false
+
+## Scope
+
+The main-thread and Offscreen viewport paths now record a shared pointer observation for mouse,
+touch, and pen input. Pointer identity, pressure, tilt, button/buttons and `pointercancel` are
+preserved with bounded values; unknown pointer types and invalid IDs fail closed. Chromium production
+events verified down/cancel pairs for all three pointer types. Firefox/WebKit are excluded.
+
+## Evidence
+
+- `npm --prefix web run build` passed.
+- `npm --prefix web run test:chromium-pointer-contract` passed: 2 protocol tests and real Chromium
+  mouse/touch/pen down/cancel events.
+- Checker output: `chromium-pointer-ok types=mouse,touch,pen cancel=PASS execution=DISABLED next=M14-04D`.
+- `npm --prefix web run typecheck` and `git diff --check` passed.
+
+## Next Task
+
+`M14-04D`: Chromium IME composition guard for incomplete operators.