Add agent context templates and project workflow

- AGENTS.md: High-level guidance for all agents in this project
- agents/HA_Planner.md, HA_Orchestrator.md, HA_Reviewer.md: Role-specific instructions
- docs/WORKFLOW.md: Project-specific workflow and context guidance

docs/WORKFLOW.md

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+# Project Workflow
+
+This document describes how agents and the human should work together in this specific project.
+
+## Coordination
+
+- All work is tracked and coordinated through the Hermes Kanban board.
+- Agents must use the SCRUM stand-up format when posting updates.
+- See `core-planning/docs/KANBAN-WORKFLOW.md` for team-wide Kanban rules.
+
+## Escalation
+
+Escalation to the human only occurs when the rules defined in `core-planning/docs/KANBAN-WORKFLOW.md` are met. Agents and `HA_Planner` should resolve issues first.
+
+## Status Reporting
+
+`HA_Planner` will deliver regular aggregated status reports to the human using input from all agents.
+
+## Context
+
+- Refer to the root `AGENTS.md` for high-level project guidance.
+- Refer to `core-planning/docs/` for team standards and execution guidelines.
+- Role-specific instructions are located in the `agents/` folder.
+
+## Getting Started
+
+When a new agent begins work on this project, they should:
+
+1. Read `AGENTS.md`
+2. Review the current state of the Kanban board
+3. Read relevant role instructions in `agents/`
+4. Follow the SCRUM format for all updates
+
+---
+
+*Update this file with any project-specific workflow nuances.*