feat(i18n): implement semantic i18n system with grammar engine
Add semantic intent system for natural language CLI interactions:
- Mode system (Normal/Strict/Collect) for missing key handling
- Subject type with fluent builder for typed subjects
- Composed type with Question/Confirm/Success/Failure forms
- 30+ core.* intents (delete, create, commit, push, etc.)
- Grammar engine: verb conjugation, noun pluralization, articles
- Template functions: title, lower, upper, past, plural, article
- Enhanced CLI: Confirm with options, Question, Choose functions
- Collect mode handler for QA testing
Usage:
i18n.T("core.delete", i18n.S("file", "config.yaml"))
result := i18n.C("core.delete", subject)
cli.ConfirmIntent("core.delete", subject)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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