Continue fold-2: migrate the pointer-deref / narrow-load / pointer-array-stride
family from bespoke build+run C twins to test/lang @test, retiring each 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); the
$(TESTS) headline drops 5. Every assert is a primitive int/bool comparison with
a width-preserving (`==`) sink so a stale high half or wrong stride FAILS; the
narrow-signed rows route through an `: i32` cast against a 64B-widened literal
to force sign-extension onto the load. Each .c row maps to one inline @test fn
(50 cases total, strict superset of the C rows):
947_deref_narrow_run.c -> deref_narrow_test.ww (#116, 10 rows: *p reads pointee width not 8B MOVQ; i32/u32/u8/i8/i16/u16 + !i32-alias + enum-i8 + bool/i64 controls)
949_ptrarr_index_run.c -> ptrarr_index_test.ww (#61, 23 rows: p[i]/(&p[i])/(*p)[i] stride by size(T); {1,2,4,8}B, const+var idx, param/local/cast bases, neighbor guards, nested *[2][3], *[3]str header, siphash round())
949_dotbase_arr_run.c -> dotbase_arr_test.ww (#135, 3 rows: (*struct).arrayfield[i] read/write/compound addresses the field)
944_def_amp_idx_run.c -> def_amp_idx_test.ww (#94, 6 rows: &D[i] over a def-array; +plain/read/2D controls)
944_alias_amp_idx_run.c -> alias_amp_idx_test.ww (#5, 8 rows: &a[i] over an alias-typed base classifies off the chased type; local/global, narrow, fwd-ref, plain+str controls)
The two sibling .c (949_dotbase_addr_slice_run, 944_alias_def_addr_run) stay in
$(TESTS): the first is run-only byteid=0 (#254 cs!=ww rows), the second carries
a LOUD rule-7 reject row — both routed to fold-3 (task #7). Bump
LANGBYTEID_EXPECTED_MIN 38->43.
Hojun-Cho
c9c5f6406f