Bootstrap: regen inventory + spine 4031/4031 coverage sync

[PurHur]

Summary

• Regenerate docs/bootstrap-inventory.md (4031 Phase A files) after vm.php-path drift
• Add eight missing spine units to compiler_lib_spine_smoke/main.php (DOM insertAdjacentHTML, param-sensitive JIT, session cookie helpers, VmPregJitStackLimitException)
• Sync spine footnotes to 4031 / 4031 across README/docs/tests
• Refresh gen-0 sidecar stamp after spine entry change

Verification

php script/bootstrap-inventory.php --check
# OK 4031/4031

php script/bootstrap-spine-count.php
# bootstrap-spine-count: 4031/4031

php script/check-selfhost-spine-coverage-sync.php
# OK (spine covers all 4031 inventory files)

php script/check-selfhost-spine-deferred-sync.php
# OK (spine 4031/4031)

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

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

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