Bootstrap: sync inventory + spine to 4311/4311 (ext/dom CDATA helpers)

[PurHur]

Summary

• Regenerate docs/bootstrap-inventory.md and docs/bootstrap-profile.json after recent ext/dom/ CDATA/text helper additions.
• Add three missing DOM spine units to test/selfhost/compiler_lib_spine_smoke/main.php.
• Refresh M2 spine footnotes and BootstrapSelfhostBundleTest assert to 4311/4311.

Closes #10290 (inventory/spine sync batch)

Test plan

php script/bootstrap-inventory.php --check
# OK 4311/4311

php script/check-selfhost-spine-coverage-sync.php
# check-selfhost-spine-coverage-sync: OK (spine covers all 4311 inventory files)

php script/check-selfhost-spine-count-sync.php
# check-selfhost-spine-count-sync: OK (spine 4311/4311 from compiler_lib_spine_smoke)

php script/check-selfhost-spine-deferred-sync.php
# check-selfhost-spine-deferred-sync: OK (0 deferred: (none); spine 4311/4311)

make bootstrap-selfhost-vm-driver-execute-probe
# bootstrap-selfhost-vm-driver-execute-probe: OK build/selfhost-lib-spine-smoke

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