K8: record blocked owner review and release evidence

docs/linuxcnc-web-wasm-browser-matrix-remediation.md

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+# Browser Matrix Remediation
+
+`coverage/browser-matrix-remediation.report.json` records K8-REL-12 browser
+matrix evidence.  The locked context still declares Chromium, Firefox and
+Safari minimums as `TBD` and the matrix status as `planned-for-m4`.
+
+This Linux environment can probe installed Chromium and Firefox binaries, but
+it has no Safari binary or browser farm.  Those smoke probes are recorded as
+environment observations only; they do not establish release minimums or
+cross-browser compatibility.  Safari remains explicitly unavailable and the
+overall release conclusion remains `STOP_RELEASE`.
+
+Unblocking requires a reviewed context update pinning all three minimums and
+executing the required workflow, offline/OPFS and failure matrix in each
+target browser.  No browser version is inferred, and the existing context
+lock is not overwritten.
+
+Regenerate it with:
+
+```bash
+python3 scripts/generate_browser_matrix_remediation.py
+```