feat: integrate CASTUO ecosystem boundary

[Traky12]

CASTÚO-SYSTEM ecosystem integration

This PR integrates the repository-specific boundary for CASTÚO-SYSTEM binary evolution.

It adds the canonical S-001A capability reference, CAP-S001A-OFFLINE-CONTINUITY, bounded evidence metadata, rollback/trust boundary references and explicit LOCAL_RESULT_NO_CLAIM / PROMOTION=BLOCKED semantics.

The package is adapted to this repository's role and does not copy production secrets, private keys, credentials, PII or unbounded claims. Local validation covers structure, JSON syntax where applicable, Python compilation where applicable and diff integrity.

Independent review, trusted signing ceremony and authorized representative rollback remain required before any green promotion.

[Traky12]

Final technical closure update

Revalidated after the independent-review runbook synchronization:

• S-001A replay: PASS_LOCAL_NO_CLAIM.
• Foreign semantic replay: PASS_FOREIGN_SEMANTIC_REPLAY.
• Negative security cases: four cases observed BLOCK as expected.
• Rollback simulation: PASS_LOCAL_NO_CLAIM with evidence preservation and retest.
• Targeted core tests: 53 passed, 1 skipped.
• JSON validation, Python compilation and diff checks passed.
• Independent review reproduction and signing runbook added.

The binary result remains intentionally BLOCK / PROMOTION=0 / LOCAL_RESULT_NO_CLAIM. Local signature verification uses a temporary non-approved root and cannot establish organizational trust. Independent reviewer attestation and representative operational rollback are still required.