refactor: Add tree-style execution flow diagrams to all workflow commands

Added tree-style execution process diagrams using ASCII art (├─, └─, │) to 34 workflow command files across three directories for improved readability and execution flow clarity.

## Changes by Directory

### workflow/ root (17 files)
- lite-plan.md, lite-execute.md, lite-fix.md
- plan.md, execute.md, replan.md
- status.md, review.md, review-fix.md
- review-session-cycle.md, review-module-cycle.md
- session commands (start, complete, resume, list)
- tdd-plan.md, tdd-verify.md, test-cycle-execute.md, test-gen.md, test-fix-gen.md

### workflow/ui-design/ (10 files)
- layout-extract.md, animation-extract.md, style-extract.md
- generate.md, import-from-code.md, codify-style.md
- imitate-auto.md, explore-auto.md
- reference-page-generator.md, design-sync.md

### workflow/tools/ (8 files)
- conflict-resolution.md, task-generate-agent.md, context-gather.md
- tdd-coverage-analysis.md, task-generate-tdd.md
- test-task-generate.md, test-concept-enhanced.md, test-context-gather.md

## Diagram Features
- Input parsing with flag enumeration
- Decision branching with conditional paths
- Phase/step hierarchy with clear nesting
- Mode detection and validation flows

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/commands/workflow/plan.md

@@ -46,6 +46,36 @@ This workflow runs **fully autonomously** once triggered. Phase 3 (conflict reso
 6. **Task Attachment Model**: SlashCommand invocation **attaches** sub-tasks to current workflow. Orchestrator **executes** these attached tasks itself, then **collapses** them after completion
 7. **⚠️ CRITICAL: DO NOT STOP**: Continuous multi-phase workflow. After executing all attached tasks, immediately collapse them and execute next phase
 
+## Execution Process
+
+```
+Input Parsing:
+   └─ Convert user input to structured format (GOAL/SCOPE/CONTEXT)
+
+Phase 1: Session Discovery
+   └─ /workflow:session:start --auto "structured-description"
+      └─ Output: sessionId (WFS-xxx)
+
+Phase 2: Context Gathering
+   └─ /workflow:tools:context-gather --session sessionId "structured-description"
+      ├─ Tasks attached: Analyze structure → Identify integration → Generate package
+      └─ Output: contextPath + conflict_risk
+
+Phase 3: Conflict Resolution (conditional)
+   └─ Decision (conflict_risk check):
+      ├─ conflict_risk ≥ medium → Execute /workflow:tools:conflict-resolution
+      │   ├─ Tasks attached: Detect conflicts → Present to user → Apply strategies
+      │   └─ Output: Modified brainstorm artifacts
+      └─ conflict_risk < medium → Skip to Phase 4
+
+Phase 4: Task Generation
+   └─ /workflow:tools:task-generate-agent --session sessionId [--cli-execute]
+      └─ Output: IMPL_PLAN.md, task JSONs, TODO_LIST.md
+
+Return:
+   └─ Summary with recommended next steps
+```
+
 ## 5-Phase Execution
 
 ### Phase 1: Session Discovery