[PRVC-CERT] Certify Corpus 1.0 across hosts and offline OCI

[ilyar]

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Certify Corpus 1.0 across hosts and offline OCI

Outcome

ProofRunner Corpus reaches PORTABLE or GOLD evidence through repeatable
execution on a second independent Linux host and offline dependency
installation through a local registry/cache.

Acceptance

• Execute all cases and variants on a second independent Linux host.
• Collect five runs for every deterministic gold candidate.
• Expected verdicts match on both hosts.
• Certification records PORTABLE or GOLD and the proven passed-case
  count.
• Validate install and tests without external network through a local
  OCI/npm registry mirror.
• Manifest checksum verification passes after evidence updates.
• External critic explicitly approves the multi-host and offline-OCI
  evidence.
• Record the product commit and independent review evidence.

Blocker

Depends on PRVC-APPROVE and PRVC-APPLY and requires a second independent Linux
host plus an offline registry/cache environment.

Tracking

• Product
  Issue #29.