🛡️ Sentinel: [CRITICAL/HIGH] Fix Unsafe Deserializers Missing in Taint Tracking

[tachyon-beep]

🚨 Severity: HIGH
💡 Vulnerability: Curated third-party deserialization sinks (dill.load, dill.loads, jsonpickle.decode, joblib.load) were missing from _SERIALISATION_SINKS in taint tracking, allowing validation provenance to persist on untrusted payloads.
🎯 Impact: Untrusted data flowing into these dangerous deserialization functions might not be properly tracked as UNKNOWN_RAW, leading to false negatives in security scanning.
🔧 Fix: Added the missing unconditional third-party deserializers to the core _SERIALISATION_SINKS mapping. Conditionally unsafe sinks (numpy.load, torch.load) were intentionally omitted.
✅ Verification: Run make test and make scan-self. Golden identity tests regenerated.

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PR created automatically by Jules for task 3316159959976357791 started by @tachyon-beep

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Pull request overview

Adds missing third‑party deserialization sinks to Wardline’s Level 2 taint tracking so calls to these APIs drop validation provenance and produce UNKNOWN_RAW, preventing false negatives in downstream security rules.

Changes:

• Extend _SERIALISATION_SINKS to include dill.load, dill.loads, jsonpickle.decode, and joblib.load.
• Ensure these sinks participate in the existing “serialisation sink ⇒ UNKNOWN_RAW” behavior (including alias-closure via call taint maps).

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