feat(budget): count the skill listing budget with make budget

scripts/budget.py holds the listing limits (1500 words in total, 40 per skill) and the one way to count a description, prints the total and the longest descriptions, reads the staged versions with --index, and exits 1 over budget. make budget [INDEX=1] runs it; test_lock.py takes its limits and counting from the script instead of its own copy. It replaces the one-liner that was run by hand a dozen times on 2026-11-03.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Makefile

@@ -1,4 +1,4 @@
-.PHONY: install project test update
+.PHONY: install project test update budget
 
 # Install the skills globally into $HOME (.agents/skills + .claude/skills).
 install:
@@ -19,3 +19,7 @@ test:
 # Update all skills to their latest versions and refresh skills-lock.json.
 update:
 	@bash scripts/update.sh
+
+# Count skill description words against the listing budget: make budget [INDEX=1]
+budget:
+	@python3 scripts/budget.py --repo . --top 5 $(if $(INDEX),--index)