Fix backlog setup: remove nested dir, add zero-padded IDs, add CLAUDE.md

@@ -0,0 +1,29 @@
+
+<!-- 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_backlog_instructions()` to load the tool-oriented overview. Use the `instruction` selector when you need `task-creation`, `task-execution`, or `task-finalization`.
+
+- **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 -->

@@ -14,3 +14,4 @@ bypass_git_hooks: false
 check_active_branches: true
 active_branch_days: 30
 task_prefix: "task"
+zero_padded_ids: 3