Release v1.1.0: fix vm-driver-probe after north-star5-fast (prelinked gen-0 seed / free invalid pointer)

[PurHur]

Context

Daily release review 2026-06-28: quick gates 4/5 green after #12564 closed (spine sync recovered). Sole remaining quick failure is vm-driver-probe.

Roadmap: #78 user release v1.1.0 gate checklist.

Failure (2026-06-28, Docker harness)

After north-star5-verify-fast succeeds in the same bundle, bootstrap-selfhost-vm-driver-execute-probe fails:

bootstrap-selfhost-vm-driver-execute-probe: sidecar stamp stale (want cd20052727b75f88d05b9258c7e2bf5a40e22e77, have <none>) — fast path skips relink
bootstrap-selfhost-vm-driver-execute-probe: seeded /compiler/build/selfhost-lib-spine-smoke from prelinked/bootstrap-gen0 (fast)
bootstrap-selfhost-vm-driver-execute-probe: prelinked seed failed VM probe; need full link or BOOTSTRAP_VM_DRIVER_EXECUTE_PROBE_FULL_LINK=1
free(): invalid pointer

Standalone make bootstrap-selfhost-vm-driver-execute-probe (fresh Docker session, existing build/selfhost-lib-spine-smoke) → OK.

Inventory/spine: 3428/3428 ✅ · spine-coverage-sync ✅ · north-star5-fast ✅.

Acceptance criteria

• ./script/release-readiness.sh --json → quick bundle 5/5 green (vm-driver-probe after north-star5-fast in same session)
• ./script/release-readiness.sh --full --json → user_release_ready: yes (re-probe after quick green)

Gate command

./script/docker-exec.sh -- bash -lc 'make north-star5-verify-fast && make bootstrap-selfhost-vm-driver-execute-probe'
./script/docker-exec.sh -- bash -lc './script/release-readiness.sh --json'
./script/docker-exec.sh -- bash -lc './script/release-readiness.sh --full --json'

Fix hints

• Refresh prelinked/bootstrap-gen0/ sidecar when spine inventory moves (3428 units; recent SplFixedArray / ReflectionProperty merges Regression: SplDoublyLinkedList::push()/pop() missing — skeleton class registered (ext/spl/spl_dllist.c) #13080–Add SplDoublyLinkedList ArrayAccess offset API (#13088) #13096)
• Or teach bootstrap-selfhost-vm-driver-execute-probe.sh to full-relink when prelinked seed fails VM probe (not only print hint)
• BOOTSTRAP_VM_DRIVER_EXECUTE_PROBE_FULL_LINK=1 make bootstrap-selfhost-vm-driver-execute-probe may confirm full-link path is green

Milestone

v1.1.0 user release — blocks tag until quick + --full bundles green.

[PurHur]

claim: worker-lane-a — batch (issues #13101, #13092)

[PurHur]

Merged via #13110

Fix: When prelinked gen-0 seed fails the native VM driver probe, fall back to full spine link instead of exiting.

Verification:

• Repro: `rm -rf build/selfhost-lib-spine-smoke build/.m3_compiler_lib_sidecar.sha` → prelinked seed fails → fallback full link → OK
• `make north-star5-verify-fast && make bootstrap-selfhost-vm-driver-execute-probe` → OK
• `./script/release-readiness.sh --json` → `user_release_ready: yes`, 5/5 quick gates green