✨ feat: Allow dot (.) in rule names

[heumsi]

Summary

• Allow . (dot) character in rule names, enabling module-path-style naming like shared.domain or context.adapters.inbound
• Update rule name validation regex from [a-zA-Z0-9_-]+ to [a-zA-Z0-9_.-]+
• Update inline ignore comment regex to also accept dots in rule names

Motivation

Inspired by heumsi/python-dependency-linter#27. Dots create a visual correspondence between rule names and their target module paths:

- name: shared.domain
  modules: src.shared.domain

Changes

• config.py: Updated _VALID_RULE_NAME_RE and error message to allow dots
• ignore.py: Updated _IGNORE_RE to allow dots in rule names within ignore comments
• test_config.py: Moved rule.name from invalid to valid cases, added shared.domain test
• test_ignore.py: Added tests for ignore comments with dotted rule names

Test plan

• All existing tests pass
• New valid rule name cases (rule.name, shared.domain) accepted
• Invalid rule names still rejected
• Inline ignore comments work with dotted rule names

🤖 Generated with Claude Code