reduce dir; try using syntax

[tiye]

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[Copilot]

Pull Request Overview

This PR simplifies the Cirru writer API by replacing the CirruWriterOptions struct with a direct use_inline boolean parameter, and modernizes the codebase to use newer MoonBit syntax features.

• Replaced CirruWriterOptions struct with direct use_inline parameter using optional syntax
• Updated imports to use modern using syntax instead of typealias
• Modernized various MoonBit syntax patterns throughout the codebase

Reviewed Changes

Copilot reviewed 9 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/writer.mbt	Removed CirruWriterOptions struct and replaced with use_inline parameter
src/s_expr.mbt	Fixed variable naming and updated string slicing syntax
src/parser_test.mbt	Updated import syntax and function call to use new parameter format
src/moon.pkg.json	Added test import configuration
src/main/moon.pkg.json	Updated import format to use object syntax
src/main/main.mbt	Updated import and function call syntax
src/lib/moon.pkg.json	Removed empty configuration file
moon.mod.json	Version bump to 0.2.0
README.md	Updated documentation to reflect new syntax and API

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