feat: dictionary infrastructure for v0.2

[aerbilir]

Summary

• Introduce DictionaryBuilder and Dictionary::fromRows() so dictionary rows only carry author fields (term, category, severity) while normalized lookup keys are derived at build time.
• Wire TurkishProfile through NormalizationPipeline so dictionary index keys use the same normalization chain as runtime matching.
• Migrate data/tr.php to author-only rows and add tests/DictionaryTest.php (12 unit tests).
• Document v0.2 breaking changes in CHANGELOG.md, docs/specification.md, and README.md.

Breaking changes (v0.2)

• Dictionary::fromArray() removed — use Dictionary::fromRows($rows, $normalizeKey) instead.
• Author dictionary rows no longer accept a normalized field.

Test plan

• composer validate
• composer test — 63 passed (100 assertions)
• Matcher regression suite unchanged (31 tests)
• VerbaGuard integration tests unchanged (15 tests)
• Dictionary validation: empty fields, invalid severity, unknown/missing fields, duplicate keys, author normalized rejection

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