Bootstrap: sync spine for GetDefinedConstantsParity after #17902 (#10249)

[PurHur]

Summary

• Lane B bootstrap fallback: #17902 landed ext/standard/GetDefinedConstantsParity.php on the vm.php path without adding it to the M2 spine bundle, breaking check-selfhost-spine-coverage-sync and ci-fast.sh.
• Add explicit spine require_once for GetDefinedConstantsParity.php; regenerate inventory/docs footnotes (4421→4422).
• Refresh gen-0 sidecar stamp (blobs unchanged — file already reachable via Module.php).

Closes #10249

Root cause

Commit c4467929c (#17902) added GetDefinedConstantsParity.php to the inventory via Module.php but omitted the spine bundle entry required by M2 coverage sync.

Verification

php script/check-selfhost-spine-coverage-sync.php
# check-selfhost-spine-coverage-sync: OK (spine covers all 4422 inventory files)

php script/check-selfhost-spine-sidecar-sync.php
# check-selfhost-spine-sidecar-sync: OK (stamp matches spine entry SHA-1 2cc78286490b86a54e8bcc61b7d8339909246831)

php script/bootstrap-inventory.php --check
# OK 4422/4422

php script/check-bootstrap-gen0-manifest-sync.php
# check-bootstrap-gen0-manifest-sync: OK

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

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