Trust: spine-sync IcuDateFormat + restamp gen-0 fingerprint (#22642)

[PurHur]

Summary

• Pillar 1: north-star5-verify --fast was red — spine missing ext/intl/IcuDateFormat.php (from Stdlib: IntlDateFormatter @calendar= TRADITIONAL via ICU udat (#22877) #22972) and lowering_source_fingerprint lagged live (ca66dbc… → 55324d08…).
• Add spine require; regenerate docs/bootstrap-inventory.md (6518/6518); restamp gen-0 provenance only.
• Does not close Gen-1+ #1492: committed gen-0 seed cannot be rebuilt — refresh OOMs at 48 GiB, 44 restamps since the blob last changed (script/bootstrap-refresh-gen0-sidecar.sh) #22642 — honest verified-fresh rebuild still needed (Bootstrap: unblock gen-0 spine refresh — docblock, ghost require, exclusive launcher (#22642) #22717 / next exclusive after Bootstrap: skip null include-binding ASSIGN operands (#22642) #22974 IncludeBinding null-op fix).

Refs #22642 · #8713 · #10533 (Pillar 1)

Test plan

• php script/check-selfhost-spine-coverage-sync.php → OK (6518/6518)
• php script/check-bootstrap-gen0-manifest-sync.php → OK (55324d0819db…)
• make north-star5-verify-fast → north-star5-verify: OK (fast)

Verification

check-selfhost-spine-coverage-sync: OK (spine covers all 6518 inventory files)
check-bootstrap-gen0-manifest-sync: OK (… lowering_source_fingerprint=55324d0819db…)
north-star5-verify: step 4f-m ok
north-star5-verify: OK (fast)

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