agra 20c767e336 refactor(ir): move pure JNI helpers into jni_descriptor.zig (A6.2 step 2) ...

Relocate the two pure JNI decision helpers out of lower.zig into
jni_descriptor.zig (already the JNI helper module), alongside the descriptor
derivation. Behavior-preserving move — no facade, since neither takes *Lowering.

- jniMangleNativeName(allocator, foreign_path, method_name) and
  isJniReturnTypeSupported(table, ret_ty) moved verbatim as pub free fns; added a
  types import + TypeId alias to jni_descriptor.zig.
- Rerouted lower.zig's 2 call sites (synthesizeJniMainStub; the JNI return-type
  guard at lower.zig:6000) through jni_descriptor.* — lower.zig already imported
  the module.
- Moved the 2 unit tests lower.test.zig -> jni_descriptor.test.zig (re-pointed to
  desc.*; a standalone TypeTable.init replaces the Module setup). Dropped the
  now-unused lower_mod alias.
- Stayed in lower.zig per PLAN A6.2 step 5/6: jniMapParamType (trivial resolveType
  wrapper), synthesizeJniMainStub(s), lowerJniCall, lowerJniConstructor,
  lowerSuperCall, getJniEnvTlFids. Java rendering stays in jni_java_emit.zig.
  Phase A6 complete.

Gate: zig build, zig build test, bash tests/run_examples.sh -> 361/0
(9 JNI .ir snapshots + 26 14xx examples green, no churn).

2026-06-03 08:28:41 +03:00

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