Files
sx/examples
agra 8fcf352de8 ffi issue-0048: bare $args slice loses .len across call — xfail lock-in
Bare `$args` evaluated inside a pack-fn body has the right `.len` /
per-element types inline, but the moment the same slice is passed
as an argument to another function, the callee silently reads
length 0 and every element comes back as undef.

Cause (per issue file): `lazyLowerFunction` saves/restores builder
state but not `pack_arg_nodes` / `pack_param_count` /
`pack_arg_types` / `inline_return_target`. When a regular fn like
`describe(args: []Any)` is lazily lowered from inside a pack-fn
mono, the outer pack maps are still active; `lowerFieldAccess`'s
`<pack_name>.len` intercept fires on `describe`'s same-named param
and bakes the outer mono's arity as a constant into describe's IR.
Every subsequent shape's call to describe returns that constant.

`examples/173-pack-bare-args-cross-call.sx` exercises four shapes
(0, 1, 3, 5 elements) through the same `describe(args: []Any)`
walker. The expected output holds the per-position type names
(`[s64]`, `[s64, string, bool]`, etc); today's diff fails — the
walker reads `args.len = 0` for every shape and returns `[]`. The
next commit fixes `lazyLowerFunction`.
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