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experiments/0005-browser-matrix/README.md

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+# Browser passport validation
+
+From project root, Python 3.10+ stdlib only:
+
+```sh
+python3 experiments/0005-browser-matrix/check.py
+```
+
+`matrix.json` contains target recipes, resource ceilings, required run-record
+fields and capability fallback rules. Normative measurement and permission
+procedures: `docs/decisions/0005-browser-matrix.md`. Target OS families/stable
+channels must be resolved to supported full builds before a real qualification;
+archive full build identifiers, installer hash or Apple OS build, app and fixture
+hashes, actual viewport and tool configuration. No browser binaries are supplied.
+
+The checker rejects missing targets/reproduction fields/fallbacks, compiler floor
+regressions, impossible RAM ceilings and missing iOS Home Screen mode. Negative
+fixtures exercise those refusals; percentile fixtures verify nearest-rank p95.
+It does not execute a browser, simulate a successful permission request, measure
+resources, qualify hardware or prove a real fallback implementation. A passing
+passport check must not be reported as passing production browser acceptance.