Checkpoint web parity through Chromium input tasks

docs/status/M13-05D.md

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+# M13-05D Status
+
+status: done  
+task: dependency severity gates and exceptions  
+updated: 2026-08-19 America/New_York  
+enablingTask: false  
+parityStateChange: false
+
+The severity policy is machine-readable: BLOCKER/HIGH block, MEDIUM requires review and LOW is tracked.
+Exceptions require a non-empty owner, non-expired ISO date, reason and alternative control. Production
+inventory has zero findings and zero exceptions, while four negative/positive exception cases are checked.
+
+- `npm --prefix web run test:dependency-severity-policy` passed.
+- `npm --prefix web run typecheck` passed.
+- `npm --prefix web run build` passed.
+- `git diff --check` passed.
+
+Next task: `M13-05E`, SBOM/license/source-offer binding.