fix: resolve CI/CD issues - remove unused dependencies and imports

- Remove unused thiserror dependency from Cargo.toml
- Remove unused imports (Text, Tabs, Widget, Event, KeyCode, KeyEventKind) from tui/mod.rs
- Remove unused imports (File, Write) from export/mod.rs
- Remove unused pub use ComplexityDistribution from core/analyzer.rs

techdebt-tracker-cli/tests/cli_tests.rs

@@ -0,0 +1,47 @@
+use assert_cmd::Command;
+use std::path::PathBuf;
+
+#[test]
+fn test_cli_help() {
+    let mut cmd = Command::cargo_bin("techdebt-tracker-cli").unwrap();
+    cmd.arg("--help")
+        .assert()
+        .success();
+}
+
+#[test]
+fn test_cli_version() {
+    let mut cmd = Command::cargo_bin("techdebt-tracker-cli").unwrap();
+    cmd.arg("--version")
+        .assert()
+        .success();
+}
+
+#[test]
+fn test_init_command() {
+    let temp_dir = tempfile::tempdir().unwrap();
+    let temp_path = temp_dir.path().to_path_buf();
+
+    let mut cmd = Command::cargo_bin("techdebt-tracker-cli").unwrap();
+    cmd.arg("init")
+        .arg("--path")
+        .arg(&temp_path)
+        .assert()
+        .success();
+
+    let config_path = temp_path.join("techdebt.yaml");
+    assert!(config_path.exists());
+
+    let content = std::fs::read_to_string(&config_path).unwrap();
+    assert!(content.contains("patterns:"));
+    assert!(content.contains("languages:"));
+}
+
+#[test]
+fn test_analyze_command_nonexistent_path() {
+    let mut cmd = Command::cargo_bin("techdebt-tracker-cli").unwrap();
+    cmd.arg("analyze")
+        .arg("/nonexistent/path")
+        .assert()
+        .failure();
+}