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/tools/test-task-generate.md

@@ -32,6 +32,29 @@ Generate test planning documents (IMPL_PLAN.md, test task JSONs, TODO_LIST.md) u
 - **Manual Mode** (default): Gemini diagnosis → user applies fixes
 - **Codex Mode** (`--use-codex`): Gemini diagnosis → Codex applies fixes with resume mechanism
 
+## Execution Process
+
+```
+Input Parsing:
+   ├─ Parse flags: --session, --use-codex, --cli-execute
+   └─ Validation: session_id REQUIRED
+
+Phase 1: Context Preparation (Command)
+   ├─ Assemble test session paths
+   │  ├─ session_metadata_path
+   │  ├─ test_analysis_results_path (REQUIRED)
+   │  └─ test_context_package_path
+   └─ Provide metadata (session_id, execution_mode, use_codex, source_session_id)
+
+Phase 2: Test Document Generation (Agent)
+   ├─ Load TEST_ANALYSIS_RESULTS.md as primary requirements source
+   ├─ Generate Test Task JSON Files (.task/IMPL-*.json)
+   │  ├─ IMPL-001: Test generation (meta.type: "test-gen")
+   │  └─ IMPL-002+: Test execution & fix (meta.type: "test-fix")
+   ├─ Create IMPL_PLAN.md (test_session variant)
+   └─ Generate TODO_LIST.md with test phase indicators
+```
+
 ## Document Generation Lifecycle
 
 ### Phase 1: Context Preparation (Command Responsibility)