Add pre-commit hooks for code quality

- Add .pre-commit-config.yaml with rustfmt, clippy, and cargo check
- Include standard pre-commit hooks for whitespace and file fixes
- Update README with development setup instructions
- Fix formatting and trailing whitespace in various files

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

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

.pre-commit-config.yaml

@@ -0,0 +1,32 @@
+# See https://pre-commit.com for more information
+repos:
+  - repo: local
+    hooks:
+      - id: rustfmt
+        name: rustfmt
+        entry: cargo fmt --
+        language: system
+        types: [rust]
+        pass_filenames: false
+
+      - id: clippy
+        name: clippy
+        entry: cargo clippy -- -D warnings
+        language: system
+        types: [rust]
+        pass_filenames: false
+
+      - id: cargo-check
+        name: cargo check
+        entry: cargo check
+        language: system
+        types: [rust]
+        pass_filenames: false
+
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-added-large-files