Hojun-Cho 374e97b9e8 test: migrate str/slice header family-1 batch to test/lang @test, retire C twins (fold-2) ...

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.

2026-06-22 09:02:40 +09:00

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