feat: Simplify agent architecture with test-fix workflow (v3.2.0)

Major architectural improvements:
- Simplify from 3 agents to 2 core agents
- Adopt "Tests Are the Review" philosophy
- Enhance test-gen as 4-phase orchestrator
- Simplify review.md following update-memory pattern

Agent Changes:
- NEW: @test-fix-agent - Execute tests, diagnose failures, fix code
- ENHANCED: @code-developer - Now writes implementation + tests together
- REMOVED: @code-review-agent, @code-review-test-agent

Task Type Updates:
- "test" → "test-gen" (generate tests)
- NEW: "test-fix" (execute and fix tests)

Workflow Improvements:
- test-gen.md: 4-phase orchestrator (context-gather → concept-enhanced → task-generate → execute)
- review.md: Simplified to optional specialized reviews (security, architecture, quality, action-items)
- All 16 files updated with new agent references

See CHANGELOG.md for full details.

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

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

.claude/workflows/workflow-architecture.md

@@ -113,8 +113,8 @@ All task files use this unified 5-field schema with optional artifacts enhanceme
   "status": "pending|active|completed|blocked|container",
 
   "meta": {
-    "type": "feature|bugfix|refactor|test|docs",
-    "agent": "code-developer|planning-agent|code-review-test-agent"
+    "type": "feature|bugfix|refactor|test-gen|test-fix|docs",
+    "agent": "@code-developer|@action-planning-agent|@test-fix-agent|@general-purpose"
   },
 
   "context": {
@@ -420,10 +420,10 @@ fi
 
 ### Agent Assignment
 Based on task type and title keywords:
-- **Planning tasks** → @planning-agent
-- **Implementation** → @code-developer
-- **Testing** → @code-review-test-agent
-- **Review** → @review-agent
+- **Planning tasks** → @action-planning-agent
+- **Implementation** → @code-developer (code + tests)
+- **Test execution/fixing** → @test-fix-agent
+- **Review** → @general-purpose (optional, only when explicitly requested)
 
 ### Execution Context
 Agents receive complete task JSON plus workflow context: