Update default model to 'anthropic/claude-opus-4.6' and refine terminal working directory settings

- Changed the default LLM model in the setup wizard and example environment file to 'anthropic/claude-opus-4.6'.
- Updated terminal working directory settings in CLI and related files to use the current directory ('.') instead of '/tmp'.
- Enhanced documentation comments for clarity on terminal configuration and working directory behavior.

.env.example

@@ -10,8 +10,8 @@
 OPENROUTER_API_KEY=
 
 # Default model to use (OpenRouter format: provider/model)
-# Examples: anthropic/claude-sonnet-4, openai/gpt-4o, google/gemini-2.0-flash, zhipuai/glm-4-plus
-LLM_MODEL=anthropic/claude-sonnet-4
+# Examples: anthropic/claude-opus-4.6, openai/gpt-4o, google/gemini-2.0-flash, zhipuai/glm-4-plus
+LLM_MODEL=anthropic/claude-opus-4.6
 
 # =============================================================================
 # TOOL API KEYS
@@ -46,8 +46,11 @@ TERMINAL_DOCKER_IMAGE=python:3.11
 TERMINAL_SINGULARITY_IMAGE=docker://python:3.11
 TERMINAL_MODAL_IMAGE=python:3.11
 
-# Working directory inside the container
-TERMINAL_CWD=/tmp
+# Working directory for terminal commands
+# For CLI: "." means current directory (resolved automatically from config.yaml)
+# For containers (docker/singularity/modal): absolute path inside the container
+# Usually managed by config.yaml (terminal.cwd) — uncomment to override
+# TERMINAL_CWD=.
 
 # Default command timeout in seconds
 TERMINAL_TIMEOUT=60