Week 3, Day 1: Planner Agent Implementation Started

Planner Agent Features:
- Implemented PlannerAgent extending BaseAgent
- Commands: *plan, *create-story, *list-stories
- Story generation with LLM (complexity estimation, acceptance criteria, tasks)
- Story file creation (Markdown with YAML frontmatter)
- Story listing and filtering by epic/status

Configuration:
- Added PlannerAgentConfig to config system
- Configurable stories directory
- Integrated with ProjectConfig

Story Features:
- Auto-generated story IDs (slug format)
- Title extraction from description
- Domain inference (basic heuristics)
- Complexity estimation (1-5 scale via LLM)
- Acceptance criteria generation
- Task breakdown generation
- Story metadata (epic, priority, status, created_at)

Files Created:
- tapps_agents/agents/planner/__init__.py
- tapps_agents/agents/planner/agent.py
- tapps_agents/agents/planner/story_template.md
- Updated tapps_agents/core/config.py (PlannerAgentConfig)

Status: Week 3 Day 1 complete - Planner Agent core implementation done

Author: wtthornton