c792642d76
Step 4A final slice's lock-in. `$args` (whole pack) as a bare
expression should evaluate to a comptime `[]Type` slice value
— the whole pack passed through as data so builder fns can
walk it.
Today's parser arm (commit fd03b58, M5.A.next.4.3) requires
the `[<int_literal>]` form: bare `$<pack_name>` hits the
focused "expected '[' after '$<pack_name>'" diagnostic I added
when wiring the indexed access.
`examples/170-pack-bare-value.sx` exercises four call shapes
of a pack-fn whose body binds `list := $args` then returns
`list.len`. Expected output (post-fix) is "0/1/3/4" per call.
Today the parser rejection diff makes the test fail —
209/209 + 1 expected-failing = 210 total.
Cadence shape 2: expected output is the WORKING shape; pre-fix
the parser-error diff fails. Next commit lands the parser
extension + AST node + lowering and the test flips green.
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