[M316][E002] Run runnable object-model storage and native-truth end-to-end validation

[doublemover]

Goal

• Run runnable object-model storage and native-truth end-to-end validation.

Material work

• Run end-to-end validation against the live implementation and fix the drift it exposes.
• Leave one durable validation path instead of adding milestone-specific closeout ceremony.
• Expand the live validation corpus and run it through the real compiler/runtime path.
• Prefer reusable acceptance coverage over ad hoc one-off validation.
• Use shared live validation and implementation paths; do not add milestone-specific scaffolding.

Done when

• Integrated validation runs against the live implementation and catches real regressions.
• The milestone can close without separate proof-only bookkeeping.

Blockers

• M316-E001
• [M316][E001] Run runtime corrective tranche milestone integration #7823 (M316-E001)

Execution Order

• Sequence status: Active cleanup milestone
• Direct issue blockers: [M316][E001] Run runtime corrective tranche milestone integration #7823 (M316-E001)
• Execution instruction: Follow the direct issue blockers in this milestone, then implement the live runtime/codegen work directly.

[doublemover]

Completed in f463474 (M316-E002 add storage ownership native truth acceptance coverage).\n\nMaterial change:\n- added a probeable m260 runtime-backed storage ownership fixture on the live compile path\n- added runtime reflection coverage for strong/copy/weak/unowned-safe/unowned-unsafe property ownership profiles and slot layout\n- extended scripts/check_objc3c_runtime_acceptance.py to assert compile truthfulness, descriptor counts, IR ownership banners, and runtime property-entry ownership snapshots against the same emitted object\n- synced runtime/live validation docs to include the new storage-ownership reflection proof path\n\nValidation run:\n- python scripts/check_objc3c_runtime_acceptance.py\n- python scripts/objc3c_public_workflow_runner.py test-fast