docs: add Hermes Agent guide to AI_DEVELOPER_WORKSTATION.md
- Add Section 3 documenting Hermes model routing (deepseek-chat / deepseek-v4-pro)
- Add Section 3.2 with 5 project-specific skills (hotel-project-map,
hotel-remuneration-orchestrator, hotel-seeding-testing, hotel-rls-verification,
hotel-n8n-deployment)
- Add Section 3.3-3.6 covering AGENTS.md, MCP servers, cron test runner,
and .hermes/ plans directory
- Add Section 3.7 quick-reference table for all common commands
- Update AGENTS.md to reference Hermes skills instead of inline
orchestration, add worktree mode guidance
- Bump AGENTS.md changelog for migration date