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/BUILD.md

@@ -0,0 +1,49 @@
+# Build Instructions
+
+This project requires a C compiler to build native dependencies.
+
+## Linux (Debian/Ubuntu)
+
+```bash
+sudo apt-get update
+sudo apt-get install -y build-essential
+```
+
+## macOS
+
+```bash
+xcode-select --install
+```
+
+## Windows
+
+Install Visual Studio Build Tools.
+
+## Building
+
+```bash
+# Navigate to project directory
+cd techdebt-tracker-cli
+
+# Build the project
+cargo build --release
+
+# Run tests
+cargo test
+
+# Run linting
+cargo clippy
+```
+
+## Dependencies Installed
+
+The project uses the following key dependencies:
+- clap 4.4 - CLI argument parsing
+- ratatui 0.26 - Terminal UI framework
+- tree-sitter 0.22 - Source code parsing
+- serde 1.0 - Serialization
+- regex 1.10 - Pattern matching
+- anyhow 1.0 - Error handling
+- ignore 0.4 - File traversal with gitignore support
+- crossterm 0.28 - Terminal capabilities
+- chrono 0.4 - Date/time handling