test: port the asserttyped stamp probes to ww; retire 954 + 956 slim carriers

954_tuprecv_run, 956_tuprecv_f64_run and 956_modqualdestr_run shared
one retained dimension: w6c_ww compiles the destructure shape cleanly
AND emits no asserttyped stderr diagnostic (#121 A-narrow / #6a-A
stamp nets) — a channel neither test/lang nor the fixture protocol
has. All 11 rows fold into one observer with the drew-C4 non-vacuity
self-check on the shared predicate. Owned legs cited, not duplicated:
value rows + byte-id ride test/lang/tuprecv_test.ww,
test/lang/tuprecv_f64_test.ww and the test-lang-byteid blanket; the
modqual values + byte-id ride the r956_modqual_* fixtures and
test-data-byteid — those four rows compile the fixture files in place
so probe and fixture cannot drift. Bundled: one file, one concern
(the wwstage stamp-absence dimension).

Makefile

@@ -408,7 +408,8 @@ OBJECT_WW_TARGETS = $(OBJECT_WW_TESTS:%=wwtest/%)
 # cstage-only rejects). Compiler/driver gates like test/sep: they run
 # under test-compiler.
 MISC_WW_TESTS = test/misc/arrglob_test.ww test/misc/packedwwi_test.ww \
-	  test/misc/reject_test.ww test/misc/heldasym_test.ww
+	  test/misc/reject_test.ww test/misc/heldasym_test.ww \
+	  test/misc/stampdiag_test.ww
 MISC_WW_TARGETS = $(MISC_WW_TESTS:%=wwtest/%)
 BOOTSTRAP_WRAPPER_SOURCES = test/wcc/950_selfcheck.c \
 	  test/wcc/991_w6a_ww.c \