Add MITRE ATT&CK framework queries to query library (#39930)
## Summary - Adds 152 MITRE ATT&CK framework threat detection queries to the Fleet query library (`docs/queries.yml`) - Queries cover Linux (23), macOS (18), and Windows (36) platforms, plus cross-platform queries - Mapped to specific ATT&CK techniques (T1025, T1033, T1053, T1078, T1548, etc.) - All queries tagged with `MITRE, ATT&CK, threat detection` for easy filtering on the website ## Details Queries are sourced from the [fleet-osquery-attck](https://github.com/MitchF/fleet-osquery-attck) project and cover: - **Discovery**: Process, account, system information, network connections - **Persistence**: Cron jobs, startup items, launch agents/daemons, registry run keys - **Credential Access**: SSH keys, browser credentials, sudoers - **Execution**: Command interpreters, scheduled tasks, shell history - **Defense Evasion**: Rootkit detection, process injection, file integrity - **Lateral Movement**: SSH connections, remote services ## Test plan - [x] Verify `docs/queries.yml` parses correctly during website build (`build-static-content.js`) - [ ] Verify MITRE queries appear on https://fleetdm.com/queries with proper platform filtering - [ ] Verify no slug collisions with existing queries - [ ] Verify contributor profile resolves for `MitchF` GitHub username
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