Initial Slug Code Rust implementation

Core features:
- OpenAI-compatible streaming provider (vLLM, Ollama, OpenAI, etc.)
- Agent loop with tool use (bash, read, write, edit, glob, grep)
- Permission system: ask/yolo/sandbox/allowEdits + glob patterns
- SLUG.md hierarchy loaded every turn (CLAUDE.md equivalent)
- Session persistence with --continue/--resume/--fork-session
- Hook system: 5 lifecycle events, command + prompt types
- Compaction: ToolResultTrim/Truncate strategies, /compact command
- Config via TOML, CLI args, env vars

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/tools/bash.rs

@@ -0,0 +1,56 @@
+use super::{Tool, ToolDefinition};
+use anyhow::Result;
+use serde_json::Value;
+use std::process::Command;
+
+pub struct BashTool;
+
+impl Tool for BashTool {
+    fn definition(&self) -> ToolDefinition {
+        ToolDefinition {
+            name: "bash".to_string(),
+            description: "Execute a bash command and return its output.".to_string(),
+            parameters: serde_json::json!({
+                "type": "object",
+                "properties": {
+                    "command": {
+                        "type": "string",
+                        "description": "The bash command to execute"
+                    }
+                },
+                "required": ["command"]
+            }),
+        }
+    }
+
+    fn execute(&self, args: &Value) -> Result<String> {
+        let command = args["command"]
+            .as_str()
+            .ok_or_else(|| anyhow::anyhow!("Missing 'command' argument"))?;
+
+        let output = Command::new("bash")
+            .arg("-c")
+            .arg(command)
+            .output()?;
+
+        let stdout = String::from_utf8_lossy(&output.stdout);
+        let stderr = String::from_utf8_lossy(&output.stderr);
+
+        let mut result = String::new();
+        if !stdout.is_empty() {
+            result.push_str(&stdout);
+        }
+        if !stderr.is_empty() {
+            if !result.is_empty() {
+                result.push('\n');
+            }
+            result.push_str("STDERR:\n");
+            result.push_str(&stderr);
+        }
+        if !output.status.success() {
+            result.push_str(&format!("\nExit code: {}", output.status.code().unwrap_or(-1)));
+        }
+
+        Ok(result)
+    }
+}