test: add iOS 27 lifecycle pass-through fixture (MBL-2232)

[Shahroz16]

Summary\n- vendor the reviewed MBL-2232 iOS lifecycle contract and relational validator\n- add one sample-only native Swift pass-through stream for existing AppDelegate and routing seats\n- preserve published wrapper code, JavaScript runtime code, delegate ownership, completion ownership, and the existing killed-state workaround\n- keep evidence claims at L0/L1 only\n\n## Validation\n- canonical validator suite: 113/113\n- native wiring tests: 5/5\n- TypeScript: pass\n- canonical lock verification: 18 files\n- Xcode 26.6 simulator builds: APN and FCM pass when stacked exactly with MBL-2278\n- independent Claude Fable adversarial review: ACCEPT\n\n## Dependencies and boundaries\n- canonical source and producer: customerio-ios PR #1209\n- CocoaPods/autolinking build stack: customerio-reactnative PR #633\n- no L2 runtime capture or physical-device APN/FCM evidence is claimed in this PR\n- MBL-2232 remains in progress until cross-SDK canonical captures are complete

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Note

Low Risk
Primarily documentation, schemas, and diagnostic/test harness wiring; no production SDK or auth paths are modified in the shown diff, and runtime L2/L3 evidence is explicitly not claimed.

Overview
Adds the byte-locked MBL-2232 iOS lifecycle trace v1 package: trace and capture-manifest JSON schemas, Python relational validator with test vectors, contract lock, and long-form docs for evidence levels (diagnostic/L2/L3), callback registry, and wrapper topologies (Flutter, Expo, standalone RN).

Documents the React Native example as an optional, harness-gated native Swift-only stream (CIO_LIFECYCLE_* env) that records existing AppDelegate/routing seats without JS producers, new delegates, or changes to the published ios/ wrapper; evidence stays L0/L1 until validated captures exist.

CI (assert-lint) uses full git history and always runs example/scripts/lifecycle-trace-native-test/wiring.test.mjs with CIO_LIFECYCLE_BASE_REF on PRs so the fixture delta is checked against the PR base while excluding stacked prerequisite commits.

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[github-actions]

Sample app builds 📱

Below you will find the list of the latest versions of the sample apps. It's recommended to always download the latest builds of the sample apps to accurately test the pull request.

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• iOS FCM: 634.12.0 (29784004)
• iOS APN: 634.12.0 (29784004)

[Shahroz16]

Closing this evidence-only PR as part of the lifecycle validation simplification. React Native remains a native pass-through unless a wrapper-specific defect is reproduced, so we will not merge a copied schema, lock, recorder, or capture harness. The focused CocoaPods prerequisite remains in #633, and runtime validation belongs in the shared MBL-2233 matrix. The branch remains available for reference.