Lint the skill scripts with everything else

make lint and make style now walk .agents/skills/*/scripts/*.sh, so a skill helper
is held to the same shellcheck pass as the sandbox, the tests and the installer.

LLM-Generated: true

Makefile

@@ -24,11 +24,12 @@ lint: ## shellcheck every shell file, in a container (nothing installed locally)
 	  $(BINS) install.sh contrib/ai-sandbox.bash \
 	  tests/run.sh tests/lib.sh tests/spike_network.sh \
 	  $$(ls tests/unit/*.sh tests/e2e/*.sh tests/fixtures/*.sh tests/fixtures/phase-lib/*.sh) \
+	  $$(ls .agents/skills/*/scripts/*.sh 2>/dev/null) \
 	  && echo "shellcheck: clean"
 
 style: ## bash-style syntax check of every shell file (fast, no deps)
 	@for f in $(BINS) install.sh contrib/*.bash tests/*.sh tests/unit/*.sh tests/e2e/*.sh \
-	          tests/fixtures/*.sh tests/fixtures/phase-lib/*.sh; do \
+	          tests/fixtures/*.sh tests/fixtures/phase-lib/*.sh .agents/skills/*/scripts/*.sh; do \
 	  [ -f "$$f" ] || continue; bash -n "$$f" || exit 1; \
 	done; echo "bash -n: clean"