65824494a7
`parseTypeExpr`'s `Closure(...)` arm now accepts a trailing `..$name` (sigil optional) as a variadic-pack marker. Pack must be terminal — `)` is the only token accepted after the name. `ClosureTypeExpr` AST gains `pack_name: ?[]const u8` carrying the identifier so later slices can name the binding. `FunctionInfo` / `ClosureInfo` in src/ir/types.zig grow a `pack_start: ?u32 = null` field. `Closure(..$args) -> R` interns as `params = []`, `pack_start = Some(0)` — distinct from any concrete `Closure(...) -> R` shape thanks to updated hash/eql arms. New constructor pair `closureTypePack` / `functionTypePack` keeps the existing single-shape constructors unchanged. `type_bridge.resolveClosureType` calls `closureTypePack` when `pack_name != null`. The pack starts after the fixed prefix, so `Closure(Prefix, ..$args)` resolves with `params = [Prefix]`, `pack_start = Some(1)`. No semantic effect yet — the signature exists in the type table but no matching code reads `pack_start`. Step 1d wires impl matching: `Closure(..$args) -> $R` binds against any concrete closure source type in `tryUserConversion` / `registerParamImpl`. `examples/154-pack-type-rep.sx` flips from rejecting-with-error to positive parse smoke (prints "pack type rep ok"). 192/192 example tests + `zig build test` green.
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