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/workflows/workflow-status/paths/quick-flow-brownfield.yaml

@@ -1,10 +1,10 @@
 # BMad Quick Flow - Brownfield
-# Fast implementation path for existing codebases (1-15 stories typically)
+# Fast spec-driven development for existing codebases (1-10 stories typically)
 
 method_name: "BMad Quick Flow"
 track: "quick-flow"
 field_type: "brownfield"
-description: "Fast tech-spec based implementation for brownfield projects"
+description: "Spec-driven development for brownfield projects - streamlined path with codebase context"
 
 phases:
   - prerequisite: true
@@ -17,7 +17,7 @@ phases:
         agent: "analyst"
         command: "document-project"
         output: "Comprehensive project documentation"
-        purpose: "Understand existing codebase before planning"
+        purpose: "Generate codebase context for spec engineering"
 
   - phase: 0
     name: "Discovery (Optional)"
@@ -37,22 +37,31 @@ phases:
         included_by: "user_choice"
 
   - phase: 1
-    name: "Planning"
+    name: "Spec Engineering"
     required: true
     workflows:
-      - id: "tech-spec"
+      - id: "create-tech-spec"
         required: true
-        agent: "pm"
-        command: "tech-spec"
-        output: "Technical Specification with stories (auto-detects epic if 2+ stories)"
-        note: "Integrates with existing codebase patterns from document-project"
+        agent: "quick-flow-solo-dev"
+        command: "create-tech-spec"
+        output: "Technical Specification with implementation-ready stories"
+        note: "Stories include codebase context from document-project"
 
   - phase: 2
     name: "Implementation"
     required: true
+    note: "Barry executes all stories, optional code-review after each"
     workflows:
-      - id: "sprint-planning"
+      - id: "dev-spec"
         required: true
-        agent: "sm"
-        command: "sprint-planning"
-        note: "Creates sprint plan with all stories"
+        repeat: true
+        agent: "quick-flow-solo-dev"
+        command: "dev-spec"
+        note: "Execute stories from spec - Barry is the one-man powerhouse"
+
+      - id: "code-review"
+        optional: true
+        repeat: true
+        agent: "quick-flow-solo-dev"
+        command: "code-review"
+        note: "Review completed story implementation"

src/modules/bmm/workflows/workflow-status/paths/quick-flow-greenfield.yaml

@@ -1,10 +1,10 @@
 # BMad Quick Flow - Greenfield
-# Fast implementation path with tech-spec planning (1-15 stories typically)
+# Fast spec-driven development path (1-10 stories typically)
 
 method_name: "BMad Quick Flow"
 track: "quick-flow"
 field_type: "greenfield"
-description: "Fast tech-spec based implementation for greenfield projects"
+description: "Spec-driven development for greenfield projects - streamlined path without sprint overhead"
 
 phases:
   - phase: 0
@@ -26,22 +26,31 @@ phases:
         note: "Can have multiple research workflows"
 
   - phase: 1
-    name: "Planning"
+    name: "Spec Engineering"
     required: true
     workflows:
-      - id: "tech-spec"
+      - id: "create-tech-spec"
         required: true
-        agent: "pm"
-        command: "tech-spec"
-        output: "Technical Specification with stories (auto-detects epic if 2+ stories)"
-        note: "Quick Spec Flow - implementation-focused planning"
+        agent: "quick-flow-solo-dev"
+        command: "create-tech-spec"
+        output: "Technical Specification with implementation-ready stories"
+        note: "Stories contain all context for execution"
 
   - phase: 2
     name: "Implementation"
     required: true
+    note: "Barry executes all stories, optional code-review after each"
     workflows:
-      - id: "sprint-planning"
+      - id: "dev-spec"
         required: true
-        agent: "sm"
-        command: "sprint-planning"
-        note: "Creates sprint plan with all stories - subsequent work tracked in sprint plan output, not workflow-status"
+        repeat: true
+        agent: "quick-flow-solo-dev"
+        command: "dev-spec"
+        note: "Execute stories from spec - Barry is the one-man powerhouse"
+
+      - id: "code-review"
+        optional: true
+        repeat: true
+        agent: "quick-flow-solo-dev"
+        command: "code-review"
+        note: "Review completed story implementation"