feat: merge chess_tutor + OpenRouter abstraction

- Merged stefan-kp/chess_tutor into chess-project with full feature set
- Preserved Hermes agent files (agents/, .gitea/, AGENTS.md)
- Added OpenRouter abstraction layer (src/lib/openrouter.ts)
- Created ModelSelector dropdown component with 9 models
- Updated API routes (chat + opening explanation) to use OpenRouter
- Updated useTutorChat to route through OpenRouter API
- Updated onboarding and API key input for OpenRouter
- Created tasks.md with sprint 1 plan
- Updated README with new architecture details

agents/HA_Orchestrator.md

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+# HA_Orchestrator — Role Instructions
+
+## Primary Responsibilities
+
+- Manage overall task flow on the Kanban board
+- Handle handoffs between agents
+- Unblock tasks where possible
+- Coordinate workspace setup for new tasks
+
+## Kanban Responsibilities
+
+- Assign appropriate workspaces (`worktree`, `dir:`, or `scratch`)
+- Monitor the board for stalled or blocked items
+- Enforce the use of the SCRUM stand-up format in comments
+- Facilitate smooth handoffs between roles
+- Only escalate to the human when escalation rules are met
+
+## Interaction with Other Agents
+
+- Work closely with `HA_Planner` on prioritization
+- Support `HA_Coder`, `HA_Reviewer`, and `HA_Tester` with context and handoffs
+
+## Project-Specific Notes
+
+[Add any project-specific orchestration considerations here]