simplify single quote usage

[tiye]

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[Copilot]

Pull request overview

This PR simplifies single quote handling by removing escape sequences for single quotes in the Cirru writer and formatter, while maintaining backward compatibility in the parser. The version is bumped from 0.2.0 to 0.2.1.

• Removes \' escape sequence generation in writer functions since single quotes are already allowed in identifiers
• Maintains backward compatibility by keeping parser support for \' escape sequences
• Adds comprehensive tests to verify single quote behavior with and without spaces

Reviewed changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/writer.rs	Removes single quote escape handling in generate_leaf() function
src/primes.rs	Removes single quote escape handling in escape_cirru_leaf() function
tests/writer_test.rs	Adds two new tests verifying single quotes work unquoted without spaces and require quotes with spaces
tests/parser_test.rs	Minor formatting improvements to condense multi-line assertions
examples/test_escape_debug.rs	Consistent indentation formatting throughout the example file
Cargo.toml	Version bump from 0.2.0 to 0.2.1
Cargo.lock	Corresponding version update to 0.2.1

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