VUH-2914 portable lifecycle result

Mac part (a) fixes two failures in the existing ScriptMirror adapter. It adds no native calls, reads, offsets or Axel phase policy.

• Duplicate effect starts that pass packet admission now preserve the current binding and make no second native birth, including held replay.
• Room retirement snapshots attack identities before native free, then checks the current resource/handle/allocation/owner binding before each free. Native destruction may erase bindings without invalidating traversal.

The baseline on unchanged product 89242559 failed three duplicate-effect assertions and aborted with AddressSanitizer heap-use-after-free in ClientEffects::Each after SmForgetAllocation erased the current iterator. Baseline log.

The fixture compiles verbatim production bodies for SmApplyRecord, SmDrainHold, SmReplay, SmResetRoom, SmRetireClientAttacks, SmForgetAllocation, native identity checks, SmDrivenActor, EnemySync::AdmitScriptCall, and the NetworkClient ScriptCall admission block. Native calls, memory and the bridge/session context are stand-ins; unrelated owner/reaction handlers are stubs. CMake regenerates the extracted bodies when source changes. A separate real ENet relay/NetworkClient loopback control in ScriptMirrorTest.cpp confirms that repeated resource IDs in increasing packet sequences reach the client. These are adapter tests, not a live-game substitute.

Existing admission/lifecycle controls pass: old packet sequence, epoch, host and delivery rejection; held attack cancellation; ordered held effect start/end; old attack end against same-handle/address replacement; unread identity refusal; final attack end after source loss; namespace separation; and reset disposal. Old packet start/end candidates are already refused upstream; no tombstone, phase state, timer or new native behavior was added for them. Repeated IDs in newer packets establish adapter admission, not evidence that Axel's host script emits duplicate starts in live play.

Checks (through clankie heavy --, serial ctest):

cmake -S . -B .local/build-vuh2914 -DCMAKE_BUILD_TYPE=Debug
cmake --build .local/build-vuh2914 --target kh2coop_script_mirror_test kh2coop_script_lifecycle_test --parallel 2
ctest --test-dir .local/build-vuh2914 -R '^kh2coop_script_(mirror|lifecycle)_test$' -V -j 1

See VUH-2914 for the fixed-run receipts and exact-head independent review.

No PC access, inject DLL build, installed-byte qualification or live Axel run. Part (b), phase/hazard parity and issue acceptance remain open for the lead's scheduled PC work.