Trust: restamp gen-0 fingerprint after Reflection/SimpleXML drift (#22159)

[PurHur]

Summary

• Restamp prelinked/bootstrap-gen0/manifest.json + .bootstrap_lowering_source.sha to live lowering_source_fingerprint 62f4265b… after post-Trust: restamp gen-0 fingerprint after post-#22130 drift (#22139) #22141 Reflection / SimpleXML / php-in-php merges left provenance stale.
• Unblocks Pillar 1: north-star5-fast step 4f-m and restores user_release_ready: yes.

Closes #22159

Test plan

• php script/check-bootstrap-gen0-manifest-sync.php → OK
• ./script/docker-exec.sh -- bash -lc 'make north-star5-verify-fast' → OK
• ./script/release-readiness.sh --json → "user_release_ready": "yes", north-star5-fast ok

Verification transcript

check-bootstrap-gen0-manifest-sync: OK (gen-0 argv driver 994944 bytes, manifest match, lowering_source_fingerprint=62f4265b4f07…)
north-star5-verify: step 4f-m ok (gen-0 manifest matches committed driver)
north-star5-verify: OK (fast — use --strict before merging bootstrap/M5 work)
"user_release_ready": "yes"

No gen-0 blob relink (documented restamp batch, same pattern as #22141/#22148).

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