# Symptom

Spreading a comptime pack `..$args` into a `[]Any` parameter — `f(..args)` where
`f` takes `items: []Any` — fails LLVM verification:

```
LLVM verification failed: Incorrect number of arguments passed to called function!
  %call = call i64 @log_count(ptr %0, { ptr, i64 }, { ptr, i64 }, double ...)
```

The spread passes the pack's N elements as N separate positional args instead of
materialising a single `[]Any` slice for the one `items` parameter.

# Reproduction

```sx
#import "modules/std.sx";
log_count :: (items: []Any) -> s64 { return items.len; }
forward :: (..$args) -> s64 { return log_count(..args); }
main :: () -> s32 { print("{}\n", forward(1, "hi", 2.5)); return 0; }
```

Expected: `3` (the pack spreads into the `[]Any` slice, like calling
`log_count(1, "hi", 2.5)` against a `[]Any` variadic would).

# Workaround / current advice

Declare the forwarder as the **slice** variadic instead of a pack — then it's
already a runtime `[]Any` and forwards directly (no spread needed):

```sx
forward :: (..args: []Any) -> s64 { return log_count(args); }   // works -> 3
```

This is what `examples/162-pack-bare-args.sx` now demonstrates, and what the
Step 2.7 pack-as-value diagnostic recommends (declare `..xs: []P` for runtime
use rather than spreading a pack).

# Suspected area

The call-arg spread lowering (`packSpreadRefs` / `lowerVariadicArgs` /
`packVariadicCallArgs` interaction in [src/ir/lower.zig](../src/ir/lower.zig)):
when the spread source is a comptime pack and the callee parameter is a single
`[]Any` (not itself variadic/pack), the spread must **collect** the pack
elements into one `[]Any` slice arg, not splat them as separate positional args.
Compare the working path where the callee is itself a `[]Any` variadic.

# Verification

The reproduction above should print `3` and pass `sx ir` LLVM verification.