Checkpoint web parity through Chromium input tasks

docs/status/M14-04D.md

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+# M14-04D Status
+
+status: done  
+task: Chromium IME composition guard for incomplete operators  
+updated: 2026-08-19 America/New_York  
+enablingTask: false  
+parityStateChange: false
+
+## Scope
+
+Added an explicit IME composition state machine and connected it to the App global shortcut gate.
+Composition start/update records pending text and blocks operator shortcuts; composition end clears
+the block without dispatching an incomplete operator. A real Chromium page dispatched composition
+events and `G`; UI revision remained unchanged during composition. Firefox/WebKit are excluded.
+
+## Evidence
+
+- `npm --prefix web run build` passed.
+- `npm --prefix web run test:chromium-ime-guard` passed: 2 protocol tests and real Chromium
+  compositionstart/update/keydown/compositionend events.
+- Checker output: `chromium-ime-ok composing=BLOCKED_OPERATOR shortcut=G revision=0 execution=DISABLED next=M14-04E`.
+- `npm --prefix web run typecheck` and `git diff --check` passed.
+
+## Next Task
+
+`M14-04E`: Chromium US/non-US/dead-key/modifier keymap fixture.