Migrate the slice/str-header core of drew's Family 1 from bespoke
build+run C twins to test/lang @test, retiring each now-redundant twin in
the same commit. Runtime coverage MOVES from $(TESTS) to test-lang (T1
runs+asserts via `ww test`) + test-lang-byteid (T2 keeps cs==ww .s
byte-id); coverage is preserved, the $(TESTS) headline drops 6 (440->434).
All asserts are primitive int/u8/bool comparisons (no fmt/strconv in the
assert path); the slice-store families poison the slot (cap!=len) and read
it back so a dropped data word FAILS.
928_str_abi_run.c -> str_abi_test.ww (str 24B ABI: .len/.cap across literal/arg/return/field/tuple/deref/index/tagged)
941_slice_store_cap_run.c -> slice_store_cap_test.ww (slice value store through indexed/field/chained lhs writes full 24B header; cap==8)
942_subslice_cap_run.c -> subslice_cap_test.ww (sub-slice cap = base_cap-lo; array/slice/str/append-no-realloc/hi-default)
943_subslice_ptresz_run.c -> subslice_ptresz_test.ww (sub-slice ptr advances lo*esz bytes; esz 2/4/8, let + call-arg)
944_deref_slice_store_run.c-> deref_slice_store_test.ww(*p=sliceval whole-deref store writes 24B header; cap==8)
949_f6_header_run.c -> f6_header_test.ww (str/slice header partial load/store; .cap/.len after clobber)
Bump LANGBYTEID_EXPECTED_MIN 16->22 to ratchet the new corpus floor.
Fan out the str-cap read (933-936) and store (937-939) families into in-language @test files, following the 932 str_elem_cap template. Additive: the *_run.c stay in the C corpus (they are the only wwstage-runtime net for these cs==ww byte-id-blind shapes); de-dup deferred to fold 6.
Per-shape @test fns, not a data table: each fn varies the codegen shape (base reg / chain depth / tuple return-ABI / store position), so the row-array idiom (blocked by #111) would lose coverage. Read family keeps the spoil()/register-clobber + junk==44 discrimination where the .c has it; store family pre-poisons the slot via a path distinct from the store under test. Asserts are primitives only.
Two more value-observable families ported additively (the .c sources
keep running in $(TESTS); de-dup deferred to fold 6).
932_str_elem_cap -> str_elem_cap_test: a str-element N_INDEX value
read must load the full 24B {ptr,len,cap}, not {ptr,len} (F2); each
shape poisons cap != len so a 2-word read fails the .cap assert.
Template for the 933-939 cap family.
957_size_type -> size_type_test: `size` binds in type position and
coexists with the size(T) operator (#85); a green row is the bind
proof.
Three more value-observable behavior families ported from the C corpus
to in-language @test, routed by the ratified observability rule (value
-> test/lang @test; process-outcome stays in runww). Additive: the .c
sources keep running in $(TESTS), so no byte-id coverage is removed --
de-dup is deferred to fold 6 (task #12).
906_callret_unsigned_arith -> callret_unsigned_test: call-result
unsigned opcode select keyed by callee return type (#168, the N_CALL
twin of gunsigned's module-global #134); operands flow through real
calls so the return-type arm is exercised, not N_IDENT.
912_sar_shr -> sar_shr_test: signed >> / >>= must emit SAR not SHR
(#136); asserts the i64/i32 value directly, dropping the C 8-bit
exit-code encoding.
793_widen_pad_zero -> widen_pad_test: widening a narrow value into a
wider tagged slot zeroes the high pad words (#227).
Batch 2 of the test-arch reframe. These three are codegen-SHAPE tests,
not data-row tests: each subject is a distinct node shape (N_IDENT
module-global read; chained N_INDEX m[i][k]; index-base node-kind). A
[N]struct row-table would interpose its own N_INDEX/N_DOT lowering and
mask the shape under test, so each uses per-shape @test fns with direct
asserts (rob-ratified rule: table where the row is data, per-fn where
the row is a codegen shape). Lossless from the matching
989_{gunsigned,chainidx,idxarg}_run.c; additive (C kept); both stages green.
Proof-of-path for the test-arch reframe: pure-behavior rows become
in-language @test row-tables run by `ww test`, reserving C drivers for
the two irreducible jobs (byte-id + bootstrap). 110_uniesc's 6 value
rows become [N]struct row-tables in a new test/lang/ tree; the trailing
.wwi round-trip stays in C as external-observer residue. Additive — the
C rows are kept; de-dup and make-rewiring land at fold 6 (task #12).
Green on both stages.
