Checkpoint web parity through Chromium input tasks

docs/status/M14-01C.md

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+# M14-01C Status
+
+status: done  
+task: WebKit capability probe  
+updated: 2026-08-19 America/New_York  
+enablingTask: false  
+parityStateChange: false
+
+WebKit `26.5` was probed against the rebuilt production assets with COOP/COEP isolation. WASM, Worker,
+IndexedDB, WebGL2, OffscreenCanvas and isolation passed. OPFS and WebGPU are explicitly blocked; the
+result does not change the Chromium-only release claim.
+
+## Evidence
+
+- `npm --prefix web run test:webkit-capability` passed.
+- Checker output: `webkit-capability-ok version=26.5 wasm=PASS,worker=PASS,opfs=BLOCKED,indexedDB=PASS,webgl2=PASS,webgpu=BLOCKED,offscreen=PASS,isolation=PASS execution=DISABLED next=M14-01D`.
+- `git diff --check` passed.
+
+## Next Task
+
+`M14-01D`: probe identity and GPU/OS adapter recording.