Bootstrap: spine sync wddx + JIT hash/multipart units (#18550)

[PurHur]

Summary

• Add 12 missing require_once entries to test/selfhost/compiler_lib_spine_smoke/main.php (ext/wddx/*, ParseStrUserScriptDelimitedJit, StringMultipartStandaloneLlvm, HashTableFindIndex/Iterate, VariableCopyFrom).
• Refresh spine footnotes to 4767/4767 and update BootstrapSelfhostBundleTest count assertion.

Closes #18550

Root cause

Inventory grew via #18541 (wddx), #18547 (hash table JIT calls), #18449 (multipart LLVM), #18548 (parse_str delimited JIT) without spine bundle updates.

Verification

php script/check-selfhost-spine-coverage-sync.php
# check-selfhost-spine-coverage-sync: OK (spine covers all 4767 inventory files)

php script/check-selfhost-spine-count-sync.php
# check-selfhost-spine-count-sync: OK (spine 4767/4767 from compiler_lib_spine_smoke)

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

./script/docker-exec.sh -- bash -lc './script/release-readiness.sh --json 2>/dev/null' | grep user_release_ready
# "user_release_ready": "yes"  (5/5 quick gates: inventory, spine-coverage, root-readme-sync, north-star5-fast, vm-driver-probe)

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