feat: word operators

[mosteo]

Fixes #16

[Copilot]

Pull request overview

This PR adds support for word operators (and, or, not) as more readable alternatives to the existing symbolic operators (&, |, !) in semantic version expressions. The implementation includes case-insensitive keyword recognition, proper word boundary detection, and comprehensive test coverage.

Changes:

• Added keyword detection for and, or, and not operators with case-insensitive matching and word boundary validation
• Updated error messages to reference word operators for better user experience
• Added comprehensive test coverage for word operators, precedence rules, and mixed operator usage
• Updated grammar documentation to reflect the new operator alternatives

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/semantic_versioning-extended.adb	Implements Is_Keyword function for keyword detection and Match_Token procedure to handle both word and symbol operators
tests/src/semver_tests-word_operators.adb	New test file covering basic word operator functionality, case insensitivity, and error cases
tests/src/semver_tests-precedences.adb	New test file verifying operator precedence and mixing word/symbol operators
tests/src/semver_tests-extended_expressions.adb	Adds integration tests for word operators in complex expressions
grammar.txt	Updates grammar documentation to show word operators as alternatives to symbols
.github/workflows/test.yml	Updates CI runners to newer versions (unrelated infrastructure improvement)

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

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