refactor(B7.2): move pack/variadic lowering to lower/pack.zig

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Verbatim relocation of the 19-method pack cluster (pack element/value
projection, spread refs, pack indexing + diagnostics, pack-to-slice,
variadic arg lowering/packing, pack-slice materialisation, pack-fn
calls + monomorphisation, pack projection resolution, isPackFn/
isPackParam predicates) into src/ir/lower/pack.zig. 19 aliases on
Lowering keep all call sites unchanged.

ProjectionPosition and PackProjection move from lower/protocol.zig to
lower/pack.zig (their domain home, next to resolvePackProjection);
the Lowering type aliases are repointed, so external references
(lower.test.zig) are unchanged.

Method pub-flip: findReturnValueType.

Gate: zig build OK; zig build test 426/426; run_examples 541/0; zero
expected/ snapshot churn.

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agra

2026-06-10 14:30:34 +03:00

parent 54db29e60a

commit 6b07346d98

3 changed files with 1161 additions and 1091 deletions

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