Add FORCE phony and conditional artifact copy

Add a FORCE phony target and make the library build pattern depend on it so the rule can be triggered reliably.

Only copy the built artifact when the cargo output path differs from the Make target to avoid installing a file onto itself and to skip redundant installs, reducing unnecessary work and potential errors.

Author: leynos

Makefile

@@ -1,4 +1,4 @@
-.PHONY: help all clean test build release lint fmt check-fmt markdownlint nixie check python-test-deps publish-check
+.PHONY: help all clean test build release lint fmt check-fmt markdownlint nixie check python-test-deps publish-check FORCE
 
 CRATE ?= ortho_config
 CARGO ?= cargo
@@ -42,14 +42,17 @@ python-test-deps: ## Ensure Python test dependencies are provisioned
 	$(PYTEST) --version > $(NULL_DEVICE)
 
 # will match target/debug/libmy_library.rlib and target/release/libmy_library.rlib
-target/%/lib$(CRATE).rlib: ## Build library in debug or release
+target/%/lib$(CRATE).rlib: FORCE ## Build library in debug or release
 	$(CARGO) build $(BUILD_JOBS)                            \
 	  $(if $(findstring release,$(@)),--release)            \
 	  --lib
-	@# copy the .rlib into your own target tree
-	install -Dm644                                           \
-	  target/$(if $(findstring release,$(@)),release,debug)/lib$(CRATE).rlib \
-	  $@
+	@# Copy artefacts only when the cargo output and make target differ.
+	src=target/$(if $(findstring release,$(@)),release,debug)/lib$(CRATE).rlib; \
+	if [ "$$src" != "$@" ]; then \
+	  install -Dm644 "$$src" "$@"; \
+	fi
+
+FORCE:
 
 lint: ## Run Clippy with warnings denied
 	RUSTDOCFLAGS="$(RUSTDOC_FLAGS)" $(CARGO) doc --workspace --no-deps