chore(bench): move iOS snapshot benchmark evidence to the evidence/ios-snapshot branch

package.json

@@ -123,6 +123,7 @@
     "perf": "node --experimental-strip-types scripts/perf/run.ts",
     "bench:ios-snapshot": "node --experimental-strip-types scripts/ios-snapshot-benchmark/run.ts",
     "bench:ios-snapshot:deep-button": "node --experimental-strip-types scripts/ios-snapshot-benchmark/deep-button.ts",
+    "bench:ios-snapshot:evidence": "node --experimental-strip-types scripts/ios-snapshot-benchmark/evidence.ts",
     "mutation:run": "node --experimental-strip-types scripts/mutation/run.ts",
     "mutation:check": "node --experimental-strip-types scripts/mutation/run.ts --no-run",
     "mutation:affected": "node --experimental-strip-types scripts/mutation/run.ts --affected",

scripts/ios-snapshot-benchmark/README.md

@@ -60,20 +60,26 @@ pnpm bench:ios-snapshot -- \
 
 The conditioner is semantics-preserving at zero packet loss. Non-zero loss is an explicit failure experiment, not a successful baseline.
 
-The complete exact-head corpus from `bench-golden-v2` (iPhone 17 Pro, iOS 27.0) is retained under
-[`evidence/`](./evidence/) from revision `71fb2483f30d90e615e949601c836aeebbf450c5`:
-
-- [`ios-snapshot-cold-local-71fb2483f.json`](./evidence/ios-snapshot-cold-local-71fb2483f.json)
+The complete exact-head corpus from `bench-golden-v2` (iPhone 17 Pro, iOS 27.0) measured at
+revision `71fb2483f30d90e615e949601c836aeebbf450c5` is published on the orphan branch
+`evidence/ios-snapshot`, pinned to the immutable tag `evidence/ios-snapshot/71fb2483f`
+(commit `2d4baf461aa8897d49c6d4683cd16d8f43588ae8`); [`evidence/README.md`](./evidence/README.md)
+records each file's sha256 and the fetch recipe against that tag and commit. The Markdown
+summaries stay under [`evidence/`](./evidence/):
+
+- [`ios-snapshot-cold-local-71fb2483f`](./evidence/ios-snapshot-cold-local-71fb2483f.md)
   covers cold-cold and cold lifecycle cells across all six screens with 10 samples per cell.
-- [`ios-snapshot-warm-relaunch-local-71fb2483f.json`](./evidence/ios-snapshot-warm-relaunch-local-71fb2483f.json)
+- [`ios-snapshot-warm-relaunch-local-71fb2483f`](./evidence/ios-snapshot-warm-relaunch-local-71fb2483f.md)
   covers warm and relaunch lifecycle cells across all six screens with 20 samples per cell and
   includes package-size measurements.
-- [`ios-snapshot-proxy-71fb2483f.json`](./evidence/ios-snapshot-proxy-71fb2483f.json) covers
+- [`ios-snapshot-proxy-71fb2483f`](./evidence/ios-snapshot-proxy-71fb2483f.md) covers
   persistent-client and fresh-process CLI cells at RTT 0, 20, and 80 ms with 20 samples per cell.
 
-Each JSON file is the schema-validated raw result from the commit named in its `revision` field;
-each has an adjacent Markdown summary. Superseded pre-admission captures are not part of the
-published corpus.
+Each JSON file is the schema-validated raw result from the commit named in its `revision` field.
+`pnpm bench:ios-snapshot:evidence -- [--evidence-dir <dir>]` re-validates a fetched or freshly
+written directory against the schema and the published hashes. `evidence-fixture.v1.json` is a
+two-cell excerpt of the warm/relaunch result that keeps the reader tested without the corpus.
+Superseded pre-admission captures are not part of the published corpus.
 
 ## Package-size evidence