🛡️ Sentinel: [security improvement]

[ightevenmckane187]

PR Description

• Severity: ENHANCEMENT
• Vulnerability: Unvalidated parameter handling in ClientManifestVerifier.ingestRevocationTicket could lead to type confusion, crashes, and potential validation bypasses if malformed tickets were processed.
• Impact: System instability or denial-of-service through processing unexpected ticket formats.
• Fix: Implemented strict type and structural validation on the ticket object, ensuring correct field types and a safe integer constraint on revocation_epoch to block NaN-bypass attacks.
• Verification: Added dedicated unit tests to tests/unit/cyphertube-core.test.ts checking all validation failure branches (null, array, invalid fields, NaN/unsafe epochs) and ran the full suite successfully.

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PR created automatically by Jules for task 954708740509352082 started by @ightevenmckane187

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