Release LexiconKit 0.2.0

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Summary

• set the additive grammatical-gender release version to 0.2.0
• finalize the backward-compatible LexiconTerm release notes
• restore conventional changelog ordering with Unreleased first

Validation

• Swift Format strict lint
• swift package dump-package
• swift test (9 tests)
• AgentGuidelines consumer setup validation
• git diff --check
• confirmed remote tag 0.2.0 does not exist

After exact-head approval and green CI, this PR will be merged before tagging and publishing 0.2.0.

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Reasoning Relay exact-head review: APPROVED

• Reviewed base: 9024f968c2a98bb011d79b7c17f114ba50dfa7a6
• Reviewed head: 953ba0745a76e07ec434795d0198d274d552835b
• Blocking findings: None
• Response hash: e445c96b4da5aa9cdfca6fb4d4d6eb9213c36d40b89430410055350c5d48c21e
• Payload hash: 45bcb323aa6080f4857ab6550f86469d7b1a49663c419c960a0c5ff0e8590674