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

tools/cli/installers/lib/ide/claude-code.js

@@ -1,4 +1,5 @@
 const path = require('node:path');
+const fs = require('fs-extra');
 const { BaseIdeSetup } = require('./_base-ide');
 const chalk = require('chalk');
 const { getProjectRoot, getSourcePath, getModulePath } = require('../../../lib/project-root');
@@ -43,7 +44,6 @@ class ClaudeCodeSetup extends BaseIdeSetup {
       const injectionConfigPath = path.join(sourceModulesPath, moduleName, 'sub-modules', 'claude-code', 'injections.yaml');
 
       if (await this.exists(injectionConfigPath)) {
-        const fs = require('fs-extra');
         const yaml = require('js-yaml');
 
         try {
@@ -87,7 +87,6 @@ class ClaudeCodeSetup extends BaseIdeSetup {
    * @param {string} projectDir - Project directory
    */
   async cleanup(projectDir) {
-    const fs = require('fs-extra');
     const bmadCommandsDir = path.join(projectDir, this.configDir, this.commandsDir, 'bmad');
 
     if (await fs.pathExists(bmadCommandsDir)) {
@@ -199,7 +198,6 @@ class ClaudeCodeSetup extends BaseIdeSetup {
    * Read and process file content
    */
   async readAndProcess(filePath, metadata) {
-    const fs = require('fs-extra');
     const content = await fs.readFile(filePath, 'utf8');
     return this.processContent(content, metadata);
   }
@@ -216,7 +214,6 @@ class ClaudeCodeSetup extends BaseIdeSetup {
    * Get agents from source modules (not installed location)
    */
   async getAgentsFromSource(sourceDir, selectedModules) {
-    const fs = require('fs-extra');
     const agents = [];
 
     // Add core agents
@@ -395,7 +392,6 @@ class ClaudeCodeSetup extends BaseIdeSetup {
    * Inject content at specified point in file
    */
   async injectContent(projectDir, injection, subagentChoices = null) {
-    const fs = require('fs-extra');
     const targetPath = path.join(projectDir, injection.file);
 
     if (await this.exists(targetPath)) {
@@ -421,7 +417,6 @@ class ClaudeCodeSetup extends BaseIdeSetup {
    * Copy selected subagents to appropriate Claude agents directory
    */
   async copySelectedSubagents(projectDir, handlerBaseDir, subagentConfig, choices, location) {
-    const fs = require('fs-extra');
     const os = require('node:os');
 
     // Determine target directory based on user choice