feat: add CodeBuddy Code support

hooks/codebuddy/README.md

@@ -0,0 +1,41 @@
+# CodeBuddy Code Hook
+
+This directory contains RTK integration files for [CodeBuddy Code](https://cnb.cool/codebuddy/codebuddy-code).
+
+## How it works
+
+RTK installs a `PreToolUse` hook into `~/.codebuddy/settings.json`. When CodeBuddy Code
+runs a Bash tool, the hook intercepts the command and rewrites it to use `rtk`, reducing
+LLM token consumption by 60-90%.
+
+## Setup
+
+```bash
+rtk init -g --agent codebuddy
+```
+
+## Files
+
+- `rtk-awareness.md` — Slim RTK awareness instructions written to `~/.codebuddy/CODEBUDDY.md`
+
+## Hook format
+
+CodeBuddy Code uses the same `PreToolUse` JSON protocol as Claude Code:
+
+```json
+{
+  "tool_name": "Bash",
+  "tool_input": { "command": "git status" }
+}
+```
+
+The hook responds with:
+
+```json
+{
+  "hookSpecificOutput": {
+    "hookEventName": "PreToolUse",
+    "updatedInput": { "command": "rtk git status" }
+  }
+}
+```

hooks/codebuddy/rtk-awareness.md

@@ -0,0 +1,29 @@
+# RTK - Rust Token Killer
+
+**Usage**: Token-optimized CLI proxy (60-90% savings on dev operations)
+
+## Meta Commands (always use rtk directly)
+
+```bash
+rtk gain              # Show token savings analytics
+rtk gain --history    # Show command usage history with savings
+rtk discover          # Analyze CodeBuddy Code history for missed opportunities
+rtk proxy <cmd>       # Execute raw command without filtering (for debugging)
+```
+
+## Installation Verification
+
+```bash
+rtk --version         # Should show: rtk X.Y.Z
+rtk gain              # Should work (not "command not found")
+which rtk             # Verify correct binary
+```
+
+⚠️ **Name collision**: If `rtk gain` fails, you may have reachingforthejack/rtk (Rust Type Kit) installed instead.
+
+## Hook-Based Usage
+
+All other commands are automatically rewritten by the CodeBuddy Code hook.
+Example: `git status` → `rtk git status` (transparent, 0 tokens overhead)
+
+Refer to CODEBUDDY.md for full command reference.

src/hooks/constants.rs

@@ -12,6 +12,8 @@ pub const BEFORE_TOOL_KEY: &str = "BeforeTool";
 pub const CLAUDE_HOOK_COMMAND: &str = "rtk hook claude";
 /// Native Rust hook command for Cursor (replaces rtk-rewrite.sh).
 pub const CURSOR_HOOK_COMMAND: &str = "rtk hook cursor";
+/// Native Rust hook command for CodeBuddy Code (replaces rtk-rewrite.sh).
+pub const CODEBUDDY_HOOK_COMMAND: &str = "rtk hook codebuddy";
 
 pub const CONFIG_DIR: &str = ".config";
 pub const OPENCODE_SUBDIR: &str = "opencode";
@@ -26,3 +28,4 @@ pub const HERMES_PLUGINS_SUBDIR: &str = "plugins";
 pub const HERMES_PLUGIN_NAME: &str = "rtk-rewrite";
 pub const HERMES_PLUGIN_INIT_FILE: &str = "__init__.py";
 pub const HERMES_PLUGIN_MANIFEST_FILE: &str = "plugin.yaml";
+pub const CODEBUDDY_DIR: &str = ".codebuddy";

src/hooks/hook_cmd.rs

@@ -397,6 +397,47 @@ fn run_claude_inner(input: &str) -> Option<String> {
     }
 }
 
+// ── CodeBuddy Code native hook ─────────────────────────────────
+
+/// Run the CodeBuddy Code PreToolUse hook natively.
+///
+/// CodeBuddy Code uses the same hook JSON protocol as Claude Code
+/// (`tool_input.command` + `PreToolUse` event), so we delegate directly
+/// to `process_claude_payload`.
+pub fn run_codebuddy() -> Result<()> {
+    let input = read_stdin_limited()?;
+
+    let input = input.trim();
+    if input.is_empty() {
+        return Ok(());
+    }
+
+    let v: Value = match serde_json::from_str(input) {
+        Ok(v) => v,
+        Err(e) => {
+            let _ = writeln!(io::stderr(), "[rtk hook] Failed to parse JSON input: {e}");
+            return Ok(());
+        }
+    };
+
+    match process_claude_payload(&v) {
+        PayloadAction::Rewrite {
+            cmd,
+            rewritten,
+            output,
+        } => {
+            audit_log("rewrite", &cmd, &rewritten);
+            let _ = writeln!(io::stdout(), "{output}");
+        }
+        PayloadAction::Skip { reason, cmd } => {
+            audit_log(reason, &cmd, "");
+        }
+        PayloadAction::Ignore => {}
+    }
+
+    Ok(())
+}
+
 // ── Cursor native hook ─────────────────────────────────────────
 
 /// Cursor on Windows ships hook payloads with one or more leading