🛡️ Sentinel: [CRITICAL] Fix SQL injection in metadata generation

[thebearwithabite]

🚨 Severity: CRITICAL
💡 Vulnerability: SQL Injection via dictionary keys
🎯 Impact: An attacker injecting arbitrary keys into the file metadata mapping could execute unparameterized SQL operations, potentially extracting sensitive data, mutating tables, or dropping the schema via INSERT OR REPLACE and ALTER TABLE.
🔧 Fix: Refactored dynamic SQL generation in metadata_generator.py to enforce a strictly validated schema allowlist fetched via PRAGMA table_info, ensuring keys map perfectly to existing database fields, while appending Python's str.isidentifier() as an additional defensive tier for new columns.
✅ Verification: Verified fix securely filters injected keys without crashing operations via test script (temp_mock.py). Recorded critical learning in .jules/sentinel.md.

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PR created automatically by Jules for task 4276451137286979743 started by @thebearwithabite

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