[codex] node:v8 lifecycle helper surfaces

[andrewtdiz]

Summary

Closes #3139
Closes #3141

• adds the node:v8 native module namespace for Perry-backed lifecycle helpers only
• implements v8.promiseHooks.onInit/onBefore/onAfter/onSettled/createHook on Perry Promise allocation, callback execution, and settlement paths
• implements v8.startupSnapshot normal-runtime helper state: isBuildingSnapshot() returns 0, registration helpers throw ERR_NOT_BUILDING_SNAPSHOT
• updates manifest/codegen/runtime dispatch, generated API docs, parity gap metadata, and a focused lifecycle fixture

Validation

• command -v curl && command -v python3 && bash ~/.codex/skills/deepwiki/scripts/run.sh --repo PerryTS/perry --question ... --output /tmp/perry-node-v8-lifecycle-deepwiki.md --timeout 1800 - passed
• cargo fmt --check - passed
• cargo check -p perry-runtime - passed
• scripts/regen_api_docs.sh - passed
• target/release/perry test-files/test_parity_v8_lifecycle.ts -o /tmp/perry_v8_lifecycle && /tmp/perry_v8_lifecycle - passed; output matches the equivalent Node plain-JS probe
• ./run_parity_tests.sh --filter test_parity_v8_lifecycle - local environment skipped the fixture because /usr/bin/node v22.22.1 is built without TypeScript stripping (ERR_NO_TYPESCRIPT for any .ts file)
• cargo test -p perry-codegen --test manifest_consistency - passed (4 tests)
• cargo test -p perry-api-manifest - passed (12 tests + doctests)
• cargo test -p perry-runtime - attempted; the parallel full suite reported gc::tests::barrier::test_minor_gc_promotes_after_two_survivals once and then hung in long GC tests. Reran cargo test -p perry-runtime gc::tests::barrier::test_minor_gc_promotes_after_two_survivals -- --nocapture and it passed.