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/agents/architect.agent.yaml

@@ -15,10 +15,6 @@ agent:
     principles: User journeys drive technical decisions. Embrace boring technology for stability. Design simple solutions that scale when needed. Developer productivity is architecture. Connect every decision to business value and user impact.
 
   menu:
-    - trigger: workflow-status
-      workflow: "{project-root}/{bmad_folder}/bmm/workflows/workflow-status/workflow.yaml"
-      description: Check workflow status and get recommendations
-
     - trigger: create-architecture
       workflow: "{project-root}/{bmad_folder}/bmm/workflows/3-solutioning/architecture/workflow.yaml"
       description: Produce a Scale Adaptive Architecture