Add PRP story task template and reorganize PRP commands (#508)

* Reorganize PRP commands and add story task template

- Move PRP commands to dedicated subdirectories
- Add new agent definitions for codebase analysis and library research
- Create story task PRP template for user story implementation
- Rename prp-base.md to prp_base.md for consistency

* Update .claude/agents/library-researcher.md

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

* Update .claude/commands/prp-claude-code/prp-story-task-create.md

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

* Update .claude/commands/prp-claude-code/prp-story-task-create.md

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

* Update PRPs/templates/prp_story_task.md

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

* Update PRPs/templates/prp_story_task.md

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

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Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

.claude/commands/prp-any-agent/prp-any-cli-execute.md

@@ -0,0 +1,40 @@
+# Execute BASE PRP
+
+Implement a feature using using the PRP file.
+
+## PRP File: $ARGUMENTS
+
+## Execution Process
+
+1. **Load PRP**
+   - Read the specified PRP file
+   - Understand all context and requirements
+   - Follow all instructions in the PRP and extend the research if needed
+   - Ensure you have all needed context to implement the PRP fully
+   - Do more web searches and codebase exploration as needed
+
+2. **ULTRATHINK**
+   - Think hard before you execute the plan. Create a comprehensive plan addressing all requirements.
+   - Break down complex tasks into smaller, manageable steps using your todos tools.
+   - Use the TodoWrite tool to create and track your implementation plan.
+   - Identify implementation patterns from existing code to follow.
+
+3. **Execute the plan**
+   - Execute the PRP
+   - Implement all the code
+
+4. **Validate**
+   - Run each validation command
+   - Fix any failures
+   - Re-run until all pass
+
+5. **Complete**
+   - Ensure all checklist items done
+   - Run final validation suite
+   - Report completion status
+   - Read the PRP again to ensure you have implemented everything
+
+6. **Reference the PRP**
+   - You can always reference the PRP again if needed
+
+Note: If validation fails, use error patterns in PRP to fix and retry.