fix(terminal): offer Copilot's, Qwen Code's, CodeBuddy's and Kimi Code's commands

All four take typed slash commands, but the composer knew none of them: `/`
opened no menu and the placeholder offered only `@` files. List each one's
everyday commands as its installed version names them: Copilot CLI 1.0,
Qwen Code 0.24, CodeBuddy Code 2.161 and Kimi Code 2.1, which has `/new`
rather than `/clear` and `/permission` in the singular.

src/terminal/composer.rs

@@ -617,6 +617,63 @@ fn builtin_commands(agent: CLIAgent) -> &'static [(&'static str, &'static str)]
             ("/mcps", "Toggle MCPs"),
             ("/help", "Help"),
         ],
+        CLIAgent::Copilot => &[
+            ("/model", "Switch the model"),
+            ("/clear", "Abandon this session and start fresh"),
+            ("/compact", "Summarize the conversation to free up context"),
+            ("/context", "Show context window usage"),
+            ("/resume", "Switch to another session"),
+            ("/review", "Review the current changes"),
+            ("/diff", "Review the changes in the current directory"),
+            ("/init", "Create Copilot instructions for this repo"),
+            ("/usage", "Show session usage metrics"),
+            ("/permissions", "Choose how requests are approved"),
+            ("/agent", "Browse and select agents"),
+            ("/mcp", "Manage MCP servers"),
+            ("/help", "Show help for interactive commands"),
+        ],
+        CLIAgent::Qwen => &[
+            ("/compress", "Summarize to free up context"),
+            ("/clear", "Clear conversation history and free up context"),
+            ("/model", "Switch the model"),
+            ("/resume", "Resume a previous session"),
+            ("/init", "Create a QWEN.md for this repo"),
+            ("/approval-mode", "Change the approval mode for tools"),
+            ("/tools", "List available tools"),
+            ("/mcp", "Manage MCP servers"),
+            ("/stats", "Show usage statistics"),
+            ("/help", "Show help"),
+        ],
+        CLIAgent::CodeBuddy => &[
+            ("/compact", "Compress context"),
+            ("/clear", "Start a new conversation"),
+            ("/model", "Switch or view the main model"),
+            ("/resume", "Resume a previous session"),
+            ("/rewind", "Rewind the conversation or code"),
+            ("/init", "Create a CODEBUDDY.md for this repo"),
+            ("/context", "Show context usage"),
+            ("/cost", "Show session cost and token usage"),
+            ("/memory", "Manage long-term memory"),
+            ("/permissions", "Manage tool permissions"),
+            ("/mcp", "Manage MCP connections"),
+            ("/status", "Show repository and session status"),
+            ("/help", "Show help"),
+        ],
+        CLIAgent::Kimi => &[
+            ("/new", "Start a fresh session"),
+            ("/compact", "Compact the conversation context"),
+            ("/model", "Switch LLM model"),
+            ("/effort", "Switch thinking effort"),
+            ("/sessions", "Browse and resume sessions"),
+            ("/undo", "Withdraw the last prompt"),
+            ("/init", "Analyze the codebase and generate AGENTS.md"),
+            ("/plan", "Toggle plan mode"),
+            ("/permission", "Select permission mode"),
+            ("/usage", "Show session tokens and context window"),
+            ("/status", "Show session and runtime status"),
+            ("/mcp", "Show MCP server status"),
+            ("/help", "Show available commands and shortcuts"),
+        ],
         // Amp has no typed commands: `/` on an empty input opens its command
         // palette, which a message cannot drive.
         _ => &[],
@@ -2798,6 +2855,10 @@ mod tests {
             CLIAgent::Codex,
             CLIAgent::Gemini,
             CLIAgent::OpenCode,
+            CLIAgent::Copilot,
+            CLIAgent::Qwen,
+            CLIAgent::CodeBuddy,
+            CLIAgent::Kimi,
         ] {
             let names: Vec<&str> = builtin_commands(agent).iter().map(|(n, _)| *n).collect();
             for (i, name) in names.iter().enumerate() {