agra 91e99f80c7 test(ir): lock generic substitution + mono keys before A4.1 extraction (A4.1 scaffolding step 1) ...

Test-first scaffolding ahead of extracting src/ir/generics.zig — no code change
to the refactor targets (buildTypeBindings / mangleGenericName / monomorphize* /
inferGenericReturnType / mangleTypeName).

Adds the first non-FFI generic/pack .ir snapshots (closing the ARCH-SAFETY §3
gap for this phase), each captured surgically via `sx ir | normalize_ir`,
path-free and idempotent:
- 0200-generics-generic            generic fn, type-param inference + mono
- 0201-generics-generic-struct     generic struct instantiation
- 0507-packs-pack-mono-dedup       mono-key dedup (same shape => one mono)
- 0518-packs-pack-value-dispatch   pack value dispatch (monomorphizePackFn)
- 0524-packs-generic-fn-pack-state-leak  pack-state isolation (issue-0048/0050
                                         class; guards the future scoped-env change)

Adds 2 unit tests via the existing public surface (no new pub exposure,
mirroring the A3.2 sub-step-1 cadence):
- mangleTypeName: pins the mono-key fragment encoding per type shape
  (s64 / ptr_X / opt_X / SL_X / mptr_X / AR_n_X / vec_n_X / struct-name / tu_X_Y).
- inferGenericReturnType: explicit type-arg path binds $T and resolves the
  -> T return (pair(s64,..) => s64, pair(f64,..) => f64).

The internal substitution/mono-key unit tests (comptime-value mangle,
buildTypeBindings strategies, scoped-env isolation) land with the generics.zig
extraction in sub-step 2, as A3.2's plan-object tests landed with CallPlan.

zig build, zig build test, tests/run_examples.sh (357/0) all green.

2026-06-02 21:05:33 +03:00

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