remove golangci-lint fallback from lint target

Simplified the lint target to just run golangci-lint directly
instead of falling back to go vet when golangci-lint is not available.

Before:
- Complex shell logic to check if golangci-lint exists
- Fallback to go vet if not found
- Confusing behavior (different tools run depending on environment)

After:
- Simple: golangci-lint run
- Clear error if golangci-lint not installed
- Consistent behavior across environments

Updated RELEASES.md to document the golangci-lint requirement.

Tested: make lint fails cleanly with clear error when golangci-lint missing.

Co-authored-by: f0ssel <[email protected]>

Author: blink-so[bot]

Makefile

@@ -71,10 +71,5 @@ fmt:
 .PHONY: lint
 lint:
 	@echo "Linting code..."
-	@if command -v golangci-lint >/dev/null 2>&1; then \
-		golangci-lint run; \
-	else \
-		echo "golangci-lint not found, running go vet instead..."; \
-		go vet ./...; \
-	fi
+	golangci-lint run
 	@echo "✓ Linting complete!"

RELEASES.md

@@ -69,6 +69,8 @@ make fmt
 make lint
 ```
 
+**Note**: The `lint` target requires [golangci-lint](https://golangci-lint.run/) to be installed.
+
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