Agent Skills: makefile-workflow

Makefile best practices for project automation and build systems. Covers command usage, target organization (PHONY vs file targets), variable management (:=, ?=, =), platform detection, common development targets (clean, test, lint, format, run), DevContainer integration, version management with semantic versioning, Docker integration, output control, error handling, and advanced patterns. Activate when working with Makefiles, make commands, .PHONY targets, build automation, or development workflows.