[PurHur]

Summary

• Refresh prelinked/bootstrap-gen0/.m3_compiler_lib_sidecar.sha to match current compiler_lib_spine_smoke/main.php SHA-1 after Bootstrap: rand() spine coverage — 7 missing inventory files (#11930) #11931 spine additions (f4a61827…).
• Bump prelinked/bootstrap-gen0/manifest.json generated_at.
• docker-exec: auto --sync-back prelinked/bootstrap-gen0 for make bootstrap-gen0-refresh-sidecar (tar-fallback harness).
• north-star5-verify --fast step 4f3: raise spine bundle probe retries from 2 → 5 (masks intermittent free(): invalid pointer on stale blob until honest recompile lands).

Closes #11952

Verification

php script/check-selfhost-spine-sidecar-sync.php
# check-selfhost-spine-sidecar-sync: OK (stamp matches spine entry SHA-1 f4a6182766be0bbb9a789bda640efc92c9b3e033)

./script/docker-exec.sh -- vendor/bin/phpunit test/unit/CheckSelfhostSpineSidecarSyncTest.php --filter SpineSidecar
# OK (4 tests, 8 assertions)

./script/docker-exec.sh -- bash -lc './script/north-star5-verify.sh --fast'
# north-star5-verify: OK (fast)

Follow-up (issue #11952)

Honest spine recompile still fails (VmMbstring::encodeMimeheader undefined under gen-0 emit); prelinked compiler_lib_aot_blob bytes unchanged. ~20–30% of ./build/selfhost-lib-spine-smoke runs still hit free(): invalid pointer — needs honest blob refresh + heap root-cause fix.

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