docs: rename general-purpose agent to universal-executor and update documentation

Major updates in this release:

1. Agent Renaming (13 files, 21 references):
   - Renamed general-purpose → universal-executor to avoid naming conflicts
   - Updated all references in commands and workflows
   - Maintained backward compatibility in documentation

2. README Updates (4 files):
   - Removed /workflow:session:start step (auto-created by /workflow:plan)
   - Simplified workflow from 4 steps to 3 steps
   - Updated version to v4.6.2
   - Added CLI tool usage guidelines

3. GETTING_STARTED Enhancements (2 files):
   - Added Design Philosophy section explaining multi-model CLI integration
   - Added comprehensive CLI tool usage guide with common workflows
   - Reorganized quick start to emphasize automatic session creation
   - Added examples for bug fixes and feature development

Files modified:
- Agent config: .claude/agents/general-purpose.md
- Commands: 7 files in .claude/commands/
- Workflows: 5 files in .claude/workflows/
- Documentation: README.md, README_CN.md, GETTING_STARTED.md, GETTING_STARTED_CN.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/commands/workflow/execute.md

@@ -466,7 +466,7 @@ Task(subagent_type="{meta.agent}",
   "status": "pending|active|completed|blocked",
   "meta": {
     "type": "feature|bugfix|refactor|test-gen|test-fix|docs",
-    "agent": "@code-developer|@test-fix-agent|@general-purpose"
+    "agent": "@code-developer|@test-fix-agent|@universal-executor"
   },
   "context": {
     "requirements": ["req1", "req2"],
@@ -552,7 +552,7 @@ meta.agent missing → Infer from meta.type:
   - "feature" → @code-developer
   - "test-gen" → @code-developer
   - "test-fix" → @test-fix-agent
-  - "review" → @general-purpose
+  - "review" → @universal-executor
   - "docs" → @doc-generator
 ```
 

.claude/commands/workflow/tools/context-gather.md

@@ -1,6 +1,6 @@
 ---
 name: gather
-description: Intelligently collect project context using general-purpose agent based on task description and package into standardized JSON
+description: Intelligently collect project context using universal-executor agent based on task description and package into standardized JSON
 argument-hint: "--session WFS-session-id \"task description\""
 examples:
   - /workflow:tools:context-gather --session WFS-user-auth "Implement user authentication system"
@@ -14,7 +14,7 @@ examples:
 Agent-driven intelligent context collector that gathers relevant information from project codebase, documentation, and dependencies based on task descriptions, generating standardized context packages.
 
 ## Core Philosophy
-- **Agent-Driven**: Delegate execution to general-purpose agent for autonomous operation
+- **Agent-Driven**: Delegate execution to universal-executor agent for autonomous operation
 - **Two-Phase Flow**: Discovery (context loading) → Execution (context gathering and packaging)
 - **Memory-First**: Reuse loaded documents from conversation memory
 - **MCP-Enhanced**: Use MCP tools for advanced code analysis and file discovery
@@ -62,7 +62,7 @@ Agent-driven intelligent context collector that gathers relevant information fro
 **Agent Invocation**:
 ```javascript
 Task(
-  subagent_type="general-purpose",
+  subagent_type="universal-executor",
   description="Gather project context and generate context package",
   prompt=`
 ## Execution Context

.claude/commands/workflow/tools/task-generate.md

@@ -174,7 +174,7 @@ This enhanced 5-field schema embeds all necessary context, artifacts, and execut
   "status": "pending|active|completed|blocked|container",
   "meta": {
     "type": "feature|bugfix|refactor|test-gen|test-fix|docs",
-    "agent": "@code-developer|@test-fix-agent|@general-purpose",
+    "agent": "@code-developer|@test-fix-agent|@universal-executor",
     "execution_group": "group-id|null",
     "context_signature": "hash-of-focus_paths-and-artifacts"
   },