feat: implement map shorthand syntax

[Seddryck]

Summary

• preserve |> as a dedicated map_shorthand CST node
• keep mapped-expression scope separate from subsequent outer pipeline operations
• add structural corpus coverage for arguments, pipelines, whitespace, malformed operators, and ordinary |

Validation

• tree-sitter test --rebuild --include "Simple map shorthand|Mapped function|Mapped multi-step|Map shorthand|Ordinary pipeline" (9/9 passed)
• full unaffected corpus excluding six pre-existing Windows CRLF-sensitive snapshots (91/91 passed)
• git diff --check

The package-level native Node build remains blocked by the existing MSBuild Release|Win32 configuration mismatch.

Closes #36

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 1e9da70 and 52e59df.

📒 Files selected for processing (6)

• grammar.js
• src/grammar.json
• src/node-types.json
• src/parser.c
• test/corpus/invalid.txt
• test/corpus/map-shorthand.txt

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