Bootstrap: spine sync for AOT exec/ob capture LLVM helpers (#10492)

[PurHur]

Summary

• Add three user-script AOT LLVM helpers to compiler_lib_spine_smoke so spine coverage matches the 4287-file Phase A inventory:
  • lib/JIT/Builtin/ObOutputExecCaptureLlvm.php
  • lib/JIT/Builtin/ProcessExecCaptureLlvm.php
  • lib/JIT/Builtin/ProcessShellExecLibc.php
• Refresh gen-0 sidecar stamp and spine footnotes (4284/4284 → 4287/4287)

Root cause

ci-fast spine-coverage-sync failed: the three JIT files landed on the bin/vm.php require path (#10492 / #15407) but were never added to the M2 spine bundle.

Verification

php script/bootstrap-inventory.php --check
# OK 4287/4287

php script/check-selfhost-spine-coverage-sync.php
# OK (spine covers all 4287 inventory files)

php script/check-selfhost-spine-count-sync.php
# OK (spine 4287/4287)

php script/check-selfhost-spine-sidecar-sync.php
# OK (stamp matches spine entry SHA-1 afec2ee9...)

./script/phpunit.sh test/unit/BootstrapSelfhostBundleTest.php
# OK (4 tests)

make bootstrap-selfhost-vm-driver-execute-probe
# OK

./script/docker-exec.sh -- bash -lc 'make bootstrap-selfhost-link'
# bootstrap-selfhost-link: OK

Refs #10492, #10249 (parity tracker note)

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