Checkpoint web parity through Chromium input tasks

docs/status/M14-04B.md

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+# M14-04B Status
+
+status: done  
+task: Chromium DPR 1/1.5/2/3 canvas and raycast consistency  
+updated: 2026-08-19 America/New_York  
+enablingTask: false  
+parityStateChange: false
+
+## Scope
+
+Shared viewport DPR and CSS-bounds NDC helpers now drive the main-thread and Offscreen viewport
+boundaries. Chromium production verification ran at device scale factors 1, 1.5, 2 and 3; the
+declared renderer cap of 2 was applied, backing dimensions matched the browser canvas, CSS dimensions
+remained `679x321`, and the same center raycast selected the same object at every scale.
+
+## Evidence
+
+- `npm --prefix web run build` passed.
+- `npm --prefix web run test:chromium-dpr-consistency` passed: 2 protocol tests and 4 real Chromium
+  production contexts.
+- Checker output: `chromium-dpr-ok dpr=1,1.5,2,3 css=679x321 selection=stable execution=DISABLED next=M14-04C`.
+- `npm --prefix web run typecheck` and `git diff --check` passed.
+
+## Next Task
+
+`M14-04C`: Chromium mouse/touch/pen pointer identity and cancellation contract.