test(ios): add a shared AX recovery conformance fixture with a host adapter

apple/snapshot-bridge/README.md

@@ -63,3 +63,19 @@ use non-launch failure codes, so the route falls back without launch re-polling.
 At each native fragment boundary, an absent or invalid child count means unknown
 completeness and fails closed. Natural leaves above that boundary need no
 continuation evidence. Unchanged native dictionaries and child arrays are reused.
+
+## Recovery conformance
+
+`contracts/fixtures/ios-ax-recovery-conformance.json` is the shared, executable
+recovery contract for this bridge and the XCTest runner's private AX bridge.
+`packages/platform-apple/src/snapshot-source/fixtures/recovery-conformance.m`
+replays each case through `captureSnapshotTree`; the runner adapter that
+replays the same cases through the XCTest runner's private AX bridge is
+pending in [#2428](https://github.com/callstack/agent-device/pull/2428), so at
+this revision only the fixture's `host-bridge` column is executed. Each
+expectation names the
+outcome, the native request accounting, and the delivered tree as a canonical
+preorder signature with its retained node count, so a producer that drops,
+duplicates, reorders, or re-parents nodes cannot pass as complete. The fixture
+records each producer's expectation and documents the intentional differences
+(depth vocabulary, ladders, completeness evidence, budgets, hint lifetime).