Refactor execution modes and CLI integration across agents

- Updated code-developer, tdd-developer, and test-fix-agent to streamline execution modes based on task.meta.execution_config.method.
- Removed legacy command handling and introduced CLI handoff for 'cli' execution method.
- Enhanced buildCliHandoffPrompt to include task JSON path and improved context handling.
- Updated task-generate-agent and task-generate-tdd to reflect new execution method mappings and removed command field from implementation_approach.
- Improved CLI settings validation in CliSettingsModal with format and length checks.
- Added localization for new CLI settings messages in English and Chinese.
- Enhanced GPU selector to use localized strings for GPU types.
- Introduced TypeScript LSP setup documentation for better user guidance.

.claude/agents/test-fix-agent.md

@@ -83,15 +83,15 @@ When task JSON contains implementation_approach array:
    - `description`: Detailed description with variable references
    - `modification_points`: Test and code modification targets
    - `logic_flow`: Test-fix iteration sequence
-   - `command`: Optional CLI command (only when explicitly specified)
    - `depends_on`: Array of step numbers that must complete first
    - `output`: Variable name for this step's output
 5. **Execution Mode Selection**:
-   - IF `command` field exists → Execute CLI command via Bash tool
-   - ELSE (no command) → Agent direct execution:
-     - Parse `modification_points` as files to modify
-     - Follow `logic_flow` for test-fix iteration
-     - Use test_commands from flow_control for test execution
+   - Based on `meta.execution_config.method`:
+     - `"cli"` → Build CLI command via buildCliHandoffPrompt() and execute via Bash tool
+     - `"agent"` (default) → Agent direct execution:
+       - Parse `modification_points` as files to modify
+       - Follow `logic_flow` for test-fix iteration
+       - Use test_commands from flow_control for test execution
 
 
 ### 1. Context Assessment & Test Discovery