test: cover exact package tool invocation paths

Makefile

@@ -851,11 +851,11 @@ clean:
 #     (it takes no -o/-I and writes asm to stdout), so the chainable sep
 #     frontend w6c is the bootstrapped target (test 994 pins w6c ==
 #     wwdump -c).
-#   - The wwstage DRIVER (`ww_ww`) is NOT yet in this loop: it cannot
-#     swap its frontend (it hardcodes <selfdir>/w6c_ww and honors no
-#     WW_W6C override). Closing that — so `ww_ww` itself carries the
-#     glue — is task #66. Until then cstage `ww` orchestrates and this
-#     bootstrap does NOT claim a fully wwstage-driven self-host.
+#   - The wwstage DRIVER (`ww_ww`) can now swap all three tools through
+#     exact-path WW_W6C/WW_W6A/WW_W6L overrides. This loop deliberately
+#     still keeps cstage `ww` as its fixed orchestrator, so the driver is
+#     outside the compared artifacts and this target does NOT yet claim a
+#     fully wwstage-driven self-host.
 #
 # Why a fourth stage? Stage 3 proves stage-1 w6c_ww and ww2 (which differ
 # in how they were built) emit the same machine code. Stage 4 proves ww3 is
@@ -940,7 +940,7 @@ nocc:
 	@rm -rf $(NOCC_OUT)
 	@mkdir -p $(NOCC_BIN) $(NOCC_LIB) $(NOCC_OBJ)
 	@# Stage 0: drop bootstrap binaries under both natural names and
-	@# the _ww-suffixed names the driver expects when shelling out.
+	@# the _ww-suffixed names used by the driver's default sibling lookup.
 	@for f in ww w6c w6a w6l; do \
 		cp $(STAGE0)/$$f $(NOCC_BIN)/$$f; \
 		cp $(STAGE0)/$$f $(NOCC_BIN)/$${f}_ww; \