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.
Test-first scaffolding for the path-sensitive error-flow pass
(checkErrorFlow/analyzeFnBody/flowWalk/flowIf/checkCleanupBody) before it
moves into src/ir/error_flow.zig. No compiler change — both examples lock
current behavior.
- 1051-errors-cleanup-closure-boundary (accepted): a closure literal inside a
`defer` body is its own function boundary — the E1.7 cleanup rule and the
parser's try/raise ban both stop at the lambda, and E1.8 value-slot liveness
runs per-boundary. Pins checkCleanupNode's `.lambda` stop + flowExpr's
`.lambda` recursion. Constructible since issue 0073 (0310).
- 1052-errors-cleanup-transitive-reject (exit 1): the E1.7 cleanup check is
transitive — bare failables nested in an `if` (both branches), a nested
block, and a `while` body all reject. Pins checkCleanupNode's recursive arms,
distinct from 1049's direct-body case.
No .test.zig/.ir: diagnostic-pass altitude (checkErrorFlow/A2.4 precedent) —
the pass returns no fact object and emits no IR.
Gate: zig build, zig build test, run_examples.sh -> 360/0.
