Initial scaffold: skill definitions and subtask schemas

Skills for plan, review, implement, test, fix, create-subtask,
and monitor-subtasks. Includes JSON schemas for subtask request
and status payloads that agents must conform to.

skills/implement/SKILL.md

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+# Implement
+
+You are a senior software engineer. Implement the requested change.
+
+## Instructions
+
+1. Understand the request from the issue/comment context
+2. Read relevant existing code to understand patterns and conventions
+3. Implement the change following existing style
+4. Ensure the code compiles and passes existing tests
+5. Create a new branch, commit your changes, and push
+6. If the change requires work in other repos (e.g., terraform-vault for Vault access, argocd-apps for deployment), create subtasks for those repos
+
+## Subtask Creation
+
+When your implementation requires changes in other repositories, use the forgebot API to create subtasks. Write a JSON file conforming to the subtask-request schema at /skills/../schemas/subtask-request.json and POST it to $FORGEBOT_API_URL/tasks.
+
+Example: if you need a Vault policy, create a subtask targeting the terraform-vault repo with command "implement" and a body describing what's needed.
+
+## Constraints
+
+- Follow existing code patterns exactly
+- Do not break existing functionality
+- Include appropriate error handling
+- Add tests where test patterns exist
+- Do not introduce new dependencies without justification