feat(tools): add filesystem tools crate with glob pattern support

- Add new tools-fs crate with read, glob, and grep utilities
- Fix glob command to support actual glob patterns (**, *) instead of just directory walking
- Rename binary from "code" to "owlen" to match package name
- Fix test to reference correct binary name "owlen"
- Add API key support to OllamaClient for authentication

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

crates/tools/fs/tests/fs_tools.rs

@@ -0,0 +1,28 @@
+use tools_fs::{read_file, glob_list, grep};
+use std::fs;
+use tempfile::tempdir;
+
+#[test]
+fn read_and_glob_respect_gitignore() {
+    let dir = tempdir().unwrap();
+    let root = dir.path();
+    fs::write(root.join("a.txt"), "hello").unwrap();
+    fs::create_dir(root.join("secret")).unwrap();
+    fs::write(root.join("secret/secret.txt"), "token=123").unwrap();
+    fs::write(root.join(".gitignore"), "secret/\n").unwrap();
+
+    let files = glob_list(root.to_str().unwrap()).unwrap();
+    assert!(files.iter().any(|p| p.ends_with("a.txt")));
+    assert!(!files.iter().any(|p| p.contains("secret.txt")));
+    assert_eq!(read_file(root.join("a.txt").to_str().unwrap()).unwrap(), "hello");
+}
+
+#[test]
+fn grep_finds_lines() {
+    let dir = tempdir().unwrap();
+    let root = dir.path();
+    fs::write(root.join("a.rs"), "fn main() { println!(\"hello\"); }").unwrap();
+
+    let hits = grep(root.to_str().unwrap(), "hello").unwrap();
+    assert!(hits.iter().any(|(_p, _ln, text)| text.contains("hello")));
+}