DanielXMoore / Civet / 24318403050

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fix: allow trailing member access after pipeline expressions (#1943)

When a pipeline ends with an indented tail (e.g. `b\n  .c`), any further
member access at the outer indentation level (e.g. `.d`) was incorrectly
parsed as a standalone ampersand-shorthand expression (`$ => $.d`).

Fix: add `AllowedTrailingCallExpressions` after `PipelineExpressionBody`
in the grammar. When trailing is present, wrap the `PipelineExpression`
in a `CallExpression`, so `a |> b\n  .c\n.d` correctly compiles to
`b.c(a).d` instead of `b.c(a); $ => $.d`.

Closes #1724

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Daniel X Moore <STRd6@users.noreply.github.com>

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