Add timestamped SQLite /feedback logs without schema changes

[charley-oai]

Summary

• keep the SQLite schema unchanged (no migrations)
• add timestamps to SQLite-backed /feedback log exports
• keep the existing SQL-side byte cap behavior and newline handling
• document the remaining fidelity gap (span prefixes + structured fields) with TODOs

Details

• update query_feedback_logs to format each exported line as:
  • YYYY-MM-DDTHH:MM:SS.ffffffZ {level} {message}
• continue scoping rows to requested-thread + same-process threadless logs
• continue capping in SQL before returning rows
• keep the existing fallback behavior unchanged when SQLite returns no rows
• update parity tests to normalize away the new timestamp prefix while we still only store message

Follow-up

• TODO already in code: persist enough span/event metadata in SQLite to reproduce span prefixes and structured fields in /feedback exports

Testing

• cargo test -p codex-state
• just fmt

[charley-oai]

@codex review this

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🎉

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