chore: add lint and test-file targets, clean up Makefile

Add lint target combining fmt-check and clippy-strict for quick
pre-commit checks. Add test-file target for running all tests in
a specific file (make test-file FILE=backup). Fix .PHONY to declare
all targets. Remove dead targets: test-bench (no benches/ dir),
test-pr-fix (ephemeral), integration-test (no scripts/ dir).
Update CLAUDE.md to reference Makefile targets instead of raw
cargo commands.

Author: dashed

CLAUDE.md

@@ -1,13 +1,21 @@
 # Git-Chain Development Guidelines
 
 ## Build, Test, Lint Commands
-- Build: `cargo build --release`
-- Run all tests: `cargo test`
-- Run a specific test: `cargo test test_name`
-- Run tests in a specific file: `cargo test --test backup`
-- Check for errors without running tests: `cargo check`
-- Format code: `cargo fmt`
-- Check for linting issues: `cargo clippy`
+
+Use the Makefile for all development tasks. Run `make help` to see all available targets.
+
+- Build: `make build` (or `make release` for release mode)
+- Run all tests: `make test` (or `make test-sequential` for single-threaded)
+- Run a specific test: `make test-specific TEST=test_name`
+- Run tests in a specific file: `make test-file FILE=backup`
+- Check for errors without building: `make check`
+- Format code: `make fmt`
+- Check formatting: `make fmt-check`
+- Lint (format check + strict clippy): `make lint`
+- Run clippy: `make clippy` (or `make clippy-strict` for CI-level strictness)
+- Full CI pipeline locally: `make ci-local`
+- Quick dev check (format + check): `make quick`
+- Clean build artifacts: `make clean`
 
 ## Code Style Guidelines
 - **Formatting**: Follow standard Rust style with 4-space indentation

Makefile

@@ -1,7 +1,15 @@
 # Git-Chain - Tool for Managing Git Branch Chains
 # Development Makefile
 
-.PHONY: help test test-sequential test-pr check clippy fmt fmt-check clean doc doc-open build release install-deps ci-local all
+.PHONY: help build release install \
+	test test-sequential test-pr test-merge test-rebase test-specific test-file \
+	check clippy clippy-strict clippy-fix fmt fmt-check lint \
+	doc doc-open clean install-deps \
+	ci-local all quick dev \
+	chain-init chain-list chain-status \
+	debug-info watch \
+	pre-release bump-version tag-version create-release \
+	test-coverage
 
 # Default target
 .DEFAULT_GOAL := help
@@ -29,7 +37,7 @@ help: ## Show this help message
 	@echo "$(BOLD)Examples:$(RESET)"
 	@echo "  make build         # Build the project"
 	@echo "  make test          # Run all tests"
-	@echo "  make check         # Quick compilation check"
+	@echo "  make lint          # Format check + strict clippy"
 	@echo "  make ci-local      # Run full CI pipeline locally"
 
 # === Building ===
@@ -73,6 +81,10 @@ test-specific: ## Run a specific test (use TEST=test_name)
 	@echo "$(BOLD)$(GREEN)Running test: $(TEST)$(RESET)"
 	@cargo test $(TEST) -- --nocapture
 
+test-file: ## Run all tests in a file (use FILE=backup)
+	@echo "$(BOLD)$(GREEN)Running tests in file: $(FILE)$(RESET)"
+	@cargo test --test $(FILE)
+
 # === Development ===
 
 check: ## Quick compilation check
@@ -99,6 +111,12 @@ fmt-check: ## Check code formatting without changing files
 	@echo "$(BOLD)$(MAGENTA)Checking code formatting...$(RESET)"
 	@cargo fmt -- --check
 
+lint: ## Run formatting check and strict clippy
+	@echo "$(BOLD)$(YELLOW)Running lint checks...$(RESET)"
+	@$(MAKE) fmt-check
+	@$(MAKE) clippy-strict
+	@echo "$(BOLD)$(GREEN)✓ Lint checks passed!$(RESET)"
+
 # === Documentation ===
 
 doc: ## Build documentation
@@ -259,18 +277,3 @@ test-coverage: ## Generate test coverage report (requires cargo-tarpaulin)
 	@cargo tarpaulin --out Html
 	@echo "$(BOLD)$(GREEN)✓ Coverage report generated in tarpaulin-report.html$(RESET)"
 
-test-bench: ## Run benchmarks
-	@echo "$(BOLD)$(CYAN)Running benchmarks...$(RESET)"
-	@cargo bench
-
-# === PR Testing ===
-
-test-pr-fix: ## Test the PR draft fix
-	@echo "$(BOLD)$(CYAN)Testing PR draft functionality fix...$(RESET)"
-	@cargo test test_pr_command_with_draft_flag -- --nocapture
-
-# === Integration Testing ===
-
-integration-test: ## Run integration test in a temporary git repo
-	@echo "$(BOLD)$(CYAN)Running integration test...$(RESET)"
-	@./scripts/integration_test.sh || echo "$(YELLOW)Integration test script not found$(RESET)"