Missing /skills and /plugin commands, and Ctrl+C unexpected exit issue

[dewu0224]

Problem Description

1. Missing common commands: Users expect /skills and /plugin commands to exist, but they don't
2. Ctrl+C unexpected exit: Accidentally pressing Ctrl+C during CLI interaction exits the tool directly, which is inconsistent with Claude Code behavior (which does not exit on Ctrl+C)

Expected Behavior

• Add /skills command for managing skills (similar to command palette in other AI IDEs)
• Add /plugin command for managing plugins
• Ctrl+C should only cancel current input/operation, not exit the CLI tool (consistent with other AI programming tools)

Environment

• OS: Windows
• OpenCode Version: Latest