Remove version evolution content from tdd-plan.md

Removed 104 lines of version history and enhancement documentation (lines 420-523):
- TDD Workflow Enhancements section
- Key Improvements (adopted features from test-gen and plan workflows)
- Workflow Comparison table (Previous vs Current)
- Migration Notes and backward compatibility info
- Configuration examples

This content represented ~19% of the file and was historical/evolutionary
information rather than core command functionality. Focuses the documentation
on what the command does, not how it evolved.

Improves task focus and documentation clarity as identified in audit report.

.claude/commands/workflow/tdd-plan.md

@@ -417,110 +417,6 @@ Convert user input to TDD-structured format:
 - **Command failure**: Keep phase in_progress, report error
 - **TDD validation failure**: Report incomplete chains or wrong dependencies
 
-## TDD Workflow Enhancements
-
-### Overview
-The TDD workflow has been significantly enhanced by integrating best practices from both traditional `plan --agent` and `test-gen` workflows, creating a hybrid approach that bridges the gap between idealized TDD and real-world development complexity.
-
-### Key Improvements
-
-#### 1. Test Coverage Analysis (Phase 3)
-**Adopted from test-gen workflow**
-
-Before planning TDD tasks, the workflow now analyzes the existing codebase:
-- Detects existing test patterns and conventions
-- Identifies current test coverage
-- Discovers related components and integration points
-- Detects test framework automatically
-
-**Benefits**:
-- Context-aware TDD planning
-- Avoids duplicate test creation
-- Enables integration with existing tests
-- No longer assumes greenfield scenarios
-
-#### 2. Iterative Green Phase with Test-Fix Cycle
-**Adopted from test-gen workflow**
-
-IMPL (Green phase) tasks now include automatic test-fix cycle for resilient implementation:
-
-**Enhanced IMPL Task Flow**:
-```
-1. Write minimal implementation code
-2. Execute test suite
-3. IF tests pass → Complete task
-4. IF tests fail → Enter fix cycle:
-   a. Gemini diagnoses with bug-fix template
-   b. Apply fix (manual or Codex)
-   c. Retest
-   d. Repeat (max 3 iterations)
-5. IF max iterations → Auto-revert changes 🔄
-```
-
-**Benefits**:
-- Faster feedback within Green phase
-- Autonomous recovery from implementation errors
-- Systematic debugging with Gemini
-- Safe rollback prevents broken state
-
-#### 3. Agent-Driven Planning
-**From plan --agent workflow**
-
-Supports action-planning-agent for more autonomous TDD planning with:
-- MCP tool integration (code-index, exa)
-- Memory-first principles
-- Brainstorming artifact integration
-- Task merging over decomposition
-
-### Workflow Comparison
-
-| Aspect | Previous | Current (Optimized) |
-|--------|----------|---------------------|
-| **Phases** | 6 (with test coverage) | 7 (added concept verification) |
-| **Context** | Greenfield assumption | Existing codebase aware |
-| **Task Structure** | 1 feature = 3 tasks (TEST/IMPL/REFACTOR) | 1 feature = 1 task (internal TDD cycle) |
-| **Task Count** | 5 features = 15 tasks | 5 features = 5 tasks (70% reduction) |
-| **Green Phase** | Single implementation | Iterative with fix cycle |
-| **Failure Handling** | Manual intervention | Auto-diagnose + fix + revert |
-| **Test Analysis** | None | Deep coverage analysis |
-| **Feedback Loop** | Post-execution | During Green phase |
-| **Task Management** | High overhead (15 tasks) | Low overhead (5 tasks) |
-| **Execution Efficiency** | Frequent context switching | Continuous context per feature |
-
-### Migration Notes
-
-**Backward Compatibility**: Fully compatible
-- Existing TDD workflows continue to work
-- New features are additive, not breaking
-- Phase 3 can be skipped if test-context-gather not available
-
-**Session Structure**:
-```
-.workflow/active/WFS-xxx/
-├── IMPL_PLAN.md (unified plan with TDD Implementation Tasks section)
-├── TODO_LIST.md (with internal TDD phase indicators)
-├── .process/
-│   ├── context-package.json
-│   ├── test-context-package.json
-│   ├── ANALYSIS_RESULTS.md (enhanced with TDD breakdown)
-│   └── green-fix-iteration-*.md (fix logs from Green phase cycles)
-└── .task/
-    ├── IMPL-1.json (Complete TDD task: Red-Green-Refactor internally)
-    ├── IMPL-2.json (Complete TDD task)
-    ├── IMPL-3.json (Complex feature container, if needed)
-    ├── IMPL-3.1.json (Complex feature subtask, if needed)
-    └── IMPL-3.2.json (Complex feature subtask, if needed)
-```
-
-**File Count Comparison**:
-- **Old structure**: 5 features = 15 task files (TEST/IMPL/REFACTOR × 5)
-- **New structure**: 5 features = 5 task files (IMPL-N × 5)
-- **Complex features**: Add container + subtasks only when necessary
-
-**Configuration Options** (in IMPL tasks):
-- `meta.max_iterations`: Fix attempts (default: 3)
-- `meta.use_codex`: Auto-fix mode (default: false)
-
 ## Related Commands
 
 **Prerequisite Commands**: