feat: add custom agents and quick-flow workflows, remove tech-spec track

Major Changes:
- Add sample custom agents demonstrating installable agent system
  - commit-poet: Generates semantic commit messages (BMAD Method repo sample)
  - toolsmith: Development tooling expert with knowledge base covering bundlers, deployment, docs, installers, modules, and tests (BMAD Method repo sample)
  - Both agents demonstrate custom agent architecture and are installable to projects via BMAD installer system
  - Include comprehensive installation guides and sidecar knowledge bases

- Add bmad-quick-flow methodology for rapid development
  - create-tech-spec: Direct technical specification workflow
  - quick-dev: Flexible execution workflow supporting both tech-spec-driven and direct instruction development
  - quick-flow-solo-dev (Barry): 1 man show agent specialized in bmad-quick-flow methodology
  - Comprehensive documentation for quick-flow approach and solo development

- Remove deprecated tech-spec workflow track
  - Delete entire tech-spec workflow directory and templates
  - Remove quick-spec-flow.md documentation (replaced by quick-flow docs)
  - Clean up unused epic and story templates

- Fix custom agent installation across IDE installers
  - Repair antigravity and multiple IDE installers to properly support custom agents
  - Enable custom agent installation via quick installer, agent installer, regular installer, and special agent installer
  - All installation methods now accessible via npx with full documentation

Infrastructure:
- Update BMM module configurations and team setups
- Modify workflow status paths to support quick-flow integration
- Reorganize documentation with new agent and workflow guides
- Add custom/ directory for user customizations
- Update platform codes and installer configurations

src/modules/bmm/docs/README.md

@@ -32,11 +32,18 @@ Understanding how BMM adapts to your needs:
   - Documentation requirements per track
   - Planning workflow routing
 
-- **[Quick Spec Flow](./quick-spec-flow.md)** - Fast-track workflow for Quick Flow track (26 min read)
-  - Bug fixes and small features
-  - Rapid prototyping approach
-  - Auto-detection of stack and patterns
-  - Minutes to implementation
+- **[BMAD Quick Flow](./bmad-quick-flow.md)** - Fast-track development workflow (32 min read)
+  - 3-step process: spec → dev → optional review
+  - Perfect for bug fixes and small features
+  - Rapid prototyping with production quality
+  - Hours to implementation, not days
+  - Barry (Quick Flow Solo Dev) agent owned
+
+- **[Quick Flow Solo Dev Agent](./quick-flow-solo-dev.md)** - Elite solo developer for rapid development (18 min read)
+  - Barry is an elite developer who thrives on autonomous execution
+  - Lives and breathes the BMAD Quick Flow workflow
+  - Takes projects from concept to deployment with ruthless efficiency
+  - No handoffs, no delays - just pure focused development
 
 ---
 
@@ -92,7 +99,8 @@ Essential reference materials:
 → Then review [Scale Adaptive System](./scale-adaptive-system.md) to understand tracks
 
 **Fix a bug or add small feature**
-→ Go directly to [Quick Spec Flow](./quick-spec-flow.md)
+→ Go to [BMAD Quick Flow](./bmad-quick-flow.md) for rapid development
+→ Or use [Quick Flow Solo Dev](./quick-flow-solo-dev.md) directly
 
 **Work with existing codebase (brownfield)**
 → Read [Brownfield Development Guide](./brownfield-guide.md)
@@ -209,11 +217,13 @@ flowchart TD
 
     QS --> DECIDE{What are you building?}
 
-    DECIDE -->|Bug fix or<br/>small feature| QSF[Quick Spec Flow]
+    DECIDE -->|Bug fix or<br/>small feature| QF[BMAD Quick Flow]
+    DECIDE -->|Need rapid<br/>development| PE[Principal Engineer]
     DECIDE -->|New project| SAS[Scale Adaptive System]
     DECIDE -->|Existing codebase| BF[Brownfield Guide]
 
-    QSF --> IMPL[Implementation]
+    QF --> IMPL[Implementation]
+    PE --> IMPL
     SAS --> IMPL
     BF --> IMPL
 
@@ -222,6 +232,8 @@ flowchart TD
     style START fill:#bfb,stroke:#333,stroke-width:2px,color:#000
     style QS fill:#bbf,stroke:#333,stroke-width:2px,color:#000
     style DECIDE fill:#ffb,stroke:#333,stroke-width:2px,color:#000
+    style QF fill:#e1f5fe,stroke:#333,stroke-width:2px,color:#000
+    style PE fill:#fff3e0,stroke:#333,stroke-width:2px,color:#000
     style IMPL fill:#f9f,stroke:#333,stroke-width:2px,color:#000
 ```