🛡️ Sentinel: [CRITICAL] Fix SQL injection in PRAGMA statement

[mapleleaflatte03]

🚨 Severity: CRITICAL
💡 Vulnerability: SQL injection vulnerability in observability_store.py via PRAGMA journal_mode={configured_journal_mode} where configured_journal_mode is taken from an environment variable without strict validation. SQLite's PRAGMA statements cannot be parameterized, making any dynamically constructed PRAGMA susceptible to injection if the input is not strictly validated.
🎯 Impact: Malicious users or misconfigurations could inject arbitrary SQL queries, leading to unauthorized data access, data modification, or denial of service by executing malicious database operations.
🔧 Fix: Implemented an explicit allowlist {'DELETE', 'TRUNCATE', 'PERSIST', 'MEMORY', 'WAL', 'OFF', '', 'DEFAULT'} to strictly validate the user-controlled configured_journal_mode environment variable before dynamically incorporating it into the PRAGMA query. Invalid values now safely fallback to 'WAL'.
✅ Verification: Ran unit tests PYTHONPATH=intelligence python3 -m unittest discover -s intelligence -p "test_*.py" to ensure no regressions were introduced. All pre-existing tests continued to fail or pass as expected on the base branch. Code review was performed successfully. Created .jules/sentinel.md to record the codebase-specific vulnerability pattern.

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PR created automatically by Jules for task 12955556602076596660 started by @mapleleaflatte03

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