Trust: restamp gen-0 fingerprint after lowering drift (#10533)

[PurHur]

Summary

• Pillar 1: north-star5-verify-fast step 4f-m was red — lowering_source_fingerprint mismatched live sources after Language: foreach(scalar) still aborts after E_WARNING — Zend continues (re-#4879, zend_vm_def.h) #23452/Language: foreach(enum case) omits name/value props — Zend yields name (+ value if backed) (Zend/zend_enum.c) #23433 merges (e8da44b1… → 42be8a79…).
• Restamped prelinked/bootstrap-gen0/manifest.json + .bootstrap_lowering_source.sha with BOOTSTRAP_GEN0_ALLOW_UNVERIFIED_STAMP=1 (blob sha/size unchanged; provenance remains unverified-restamp).
• Honest gen-0 rebuild still blocked by 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 OOM / tracked by Bootstrap: committed gen-0 driver cannot compile anything — every input fails at parseAndCompile #23468.

Test plan

• php script/check-bootstrap-gen0-manifest-sync.php → OK (42be8a791df6…)
• ./script/docker-exec.sh -- bash -lc 'make north-star5-verify-fast' → OK (fast)

north-star5-verify: step 4f-m ok (gen-0 manifest matches committed driver)
north-star5-verify: step 4f2 ok
north-star5-verify: OK (fast — use --strict before merging bootstrap/M5 work)

Refs #10533

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