chore: bootstrap repository tooling and release automation

AGENTS.md

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+<!-- BACKLOG.MD MCP GUIDELINES START -->
+
+<CRITICAL_INSTRUCTION>
+
+## BACKLOG WORKFLOW INSTRUCTIONS
+
+This project uses Backlog.md MCP for all task and project management activities.
+
+**CRITICAL GUIDANCE**
+
+- If your client supports MCP resources, read `backlog://workflow/overview` to understand when and how to use Backlog for this project.
+- If your client only supports tools or the above request fails, call `backlog.get_workflow_overview()` tool to load the tool-oriented overview (it lists the matching guide tools).
+
+- **First time working here?** Read the overview resource IMMEDIATELY to learn the workflow
+- **Already familiar?** You should have the overview cached ("## Backlog.md Overview (MCP)")
+- **When to read it**: BEFORE creating tasks, or when you're unsure whether to track work
+
+These guides cover:
+- Decision framework for when to create tasks
+- Search-first workflow to avoid duplicates
+- Links to detailed guides for task creation, execution, and finalization
+- MCP tools reference
+
+You MUST read the overview resource to understand the complete workflow. The information is NOT summarized here.
+
+</CRITICAL_INSTRUCTION>
+
+<!-- BACKLOG.MD MCP GUIDELINES END -->