add: dev workflow shenanigans

some shit

Makefile.am

@@ -12,7 +12,25 @@ release: all
 bench: release
 	./benchmarks/test-all.sh
 
+# --- developer conveniences ---
+# compile_commands.json for clangd (bear if present, else Makefile-derived).
+compile-commands:
+	./scripts/gen-compile-commands.sh
+
+# Make the code confess to the style guide.
+format:
+	clang-format -i $(fastwc_SOURCES)
+
+# Verify the code already confesses, without touching it.
+format-check:
+	clang-format --dry-run --Werror $(fastwc_SOURCES)
+
+# Static analysis via clang-tidy (needs compile_commands.json).
+# Warnings are errors: the style guide is the law.
+lint: compile-commands
+	clang-tidy -p . --warnings-as-errors='*' $(fastwc_SOURCES)
+
 clean-local:
 	rm -rf bin
 
-.PHONY: release bench
+.PHONY: release bench compile-commands format format-check lint