Surface rename of the signed integer family: s1..s64 become i1..i64
(u1..u64, usize, isize unchanged). 'string' keeps the s-prefix arm in
name classification; width parsing moves to the i-prefix arm next to
isize.
Internal TypeId tags follow the surface (.s8/.s16/.s32/.s64 ->
.i8/.i16/.i32/.i64), as do mono-key mangle fragments (ptr_i64,
tu_i64_bool) and all display/diagnostic formatting (i{d}).
Migrated in the same sweep: stdlib + examples + issue repros + FFI C
companions (shared symbol names like ffi_id_i64), expected
stdout/stderr/ir snapshots, specs.md, readme.md, CLAUDE.md/AGENTS.md,
implementation_plan.md, docs/, issue writeups. Vendored stb_image and
historical flow state left untouched.
zig build test: 426/426; examples suite: 595/595.
Value-const SELECTION was source-aware for emission/folding (F2/R1/F1), but
expression TYPE inference still read the global last-wins `module_const_map`,
so an inferred return type / coercion on a same-name const borrowed another
module's const TYPE (mixed-type same-name consts were never exercised by the
attempt-1 same-typed goldens).
- expr_typer.zig: the `.identifier` const path now selects via the source-aware
`selectModuleConst` (own-wins / one-flat-visible) instead of the global
`module_const_map`. The global map still gates "is this a const name?"; an
unpartitioned registration-only author emits its global type, and an ambiguous
bare reference yields `.unresolved` (the emission path diagnoses loudly).
- lower.zig: expose `selectModuleConst` so the type-inference path shares the one
author selector emission/folding already use.
Audited every `module_const_map` read: emission (4102) and global-init copy
(1447) were already source-aware (attempt-1); the binds-a-value predicate (6400)
is a boolean, not a type read; the in-`selectModuleConst` read (13842) is the
unwired fallback. No sibling inference site leaks.
examples: 0793 mixed-type own-wins inference (A's `K:s32` yields `1`, not the
global `f64`'s `1.000000`); 0794 mixed-type bare → loud ambiguous (exit 1), the
inference change does not mask the ambiguity. Prior E5 surfaces (0786-0792), the
0105 set (0752-0758), E1-E4 type surfaces (0763-0785) and FFI byte-identical;
533 markers green.
