feat: add custom agent support to more IDEs

## Added installCustomAgentLauncher function to:

✅ Cline (.clinerules/workflows/)
- Creates workflow files with custom agent launchers
- Format: bmad-custom-{agent-name}.md

✅ Crush (.crush/commands/bmad/)
- Creates command files with custom agent launchers
- Format: custom-{agent-name}.md

✅ Gemini (.gemini/commands/)
- Creates TOML command files with custom agent launchers
- Format: bmad-custom-{agent-name}.toml

✅ iFlow (.iflow/commands/bmad/)
- Creates command files with custom agent launchers
- Format: custom-{agent-name}.md

## All Custom Agent Launchers Include:
- @agentPath reference to load complete agent
- Usage instructions for loading first, then activating
- Proper IDE-specific formatting and file structure
- Return values for tracking installations

Now custom agents install to 8+ IDEs instead of just 4!

tools/cli/installers/lib/ide/gemini.js

@@ -201,6 +201,53 @@ ${contentWithoutFrontmatter}
       }
     }
   }
+
+  /**
+   * Install a custom agent launcher for Gemini
+   * @param {string} projectDir - Project directory
+   * @param {string} agentName - Agent name (e.g., "fred-commit-poet")
+   * @param {string} agentPath - Path to compiled agent (relative to project root)
+   * @param {Object} metadata - Agent metadata
+   * @returns {Object} Installation result
+   */
+  async installCustomAgentLauncher(projectDir, agentName, agentPath, metadata) {
+    const geminiDir = path.join(projectDir, this.configDir);
+    const commandsDir = path.join(geminiDir, this.commandsDir);
+
+    // Create .gemini/commands directory if it doesn't exist
+    await fs.ensureDir(commandsDir);
+
+    // Create custom agent launcher in TOML format
+    const launcherContent = `description = "Custom BMAD Agent: ${agentName}"
+prompt = """
+**⚠️ IMPORTANT**: Run @${agentPath} first to load the complete agent!
+
+This is a launcher for the custom BMAD agent "${agentName}".
+
+## Usage
+1. First run: \`${agentPath}\` to load the complete agent
+2. Then use this command to activate ${agentName}
+
+The agent will follow the persona and instructions from the main agent file.
+
+---
+
+*Generated by BMAD Method*
+"""`;
+
+    const fileName = `bmad-custom-${agentName.toLowerCase()}.toml`;
+    const launcherPath = path.join(commandsDir, fileName);
+
+    // Write the launcher file
+    await fs.writeFile(launcherPath, launcherContent, 'utf8');
+
+    return {
+      ide: 'gemini',
+      path: path.relative(projectDir, launcherPath),
+      command: agentName,
+      type: 'custom-agent-launcher',
+    };
+  }
 }
 
 module.exports = { GeminiSetup };