Add C4 architecture diagram skills for Claude Code

Two skills for generating C4 model diagrams as draw.io XML:
- /c4-analyze: generates diagrams from codebase analysis
- /c4-diagram: generates diagrams from conversational description

Includes Makefile for symlink-based install to ~/.claude/skills/.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..e95e876
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,39 @@
+SKILLS_DIR := $(HOME)/.claude/skills
+SKILLS := c4-analyze c4-diagram
+
+.PHONY: install uninstall list
+
+install:
+	@mkdir -p $(SKILLS_DIR)
+	@for skill in $(SKILLS); do \
+		if [ -L "$(SKILLS_DIR)/$$skill" ]; then \
+			echo "  skip  $$skill (already linked)"; \
+		elif [ -e "$(SKILLS_DIR)/$$skill" ]; then \
+			echo "  WARN  $$skill exists and is not a symlink — skipping"; \
+		else \
+			ln -s "$(CURDIR)/$$skill" "$(SKILLS_DIR)/$$skill"; \
+			echo "  link  $$skill → $(SKILLS_DIR)/$$skill"; \
+		fi \
+	done
+	@echo "done"
+
+uninstall:
+	@for skill in $(SKILLS); do \
+		if [ -L "$(SKILLS_DIR)/$$skill" ]; then \
+			rm "$(SKILLS_DIR)/$$skill"; \
+			echo "  rm    $$skill"; \
+		else \
+			echo "  skip  $$skill (not a symlink)"; \
+		fi \
+	done
+	@echo "done"
+
+list:
+	@echo "Skills:"
+	@for skill in $(SKILLS); do \
+		if [ -L "$(SKILLS_DIR)/$$skill" ]; then \
+			echo "  ✓ $$skill (installed)"; \
+		else \
+			echo "  - $$skill"; \
+		fi \
+	done