Add unit tests for the glossary term lookup and definitions

[Baskarayelu]

Closes #988

Summary

• Add src/lib/__tests__/glossary.test.ts with 5 focused test cases
• Verifies all defined terms resolve to non-empty definitions
• Covers exact key lookups for all 5 protocol terms
• Tests the missing-term branch (unknown key returns undefined)
• Validates case-insensitive normalization behaviour
• Guards against duplicate keys

Test output

All 5 tests pass against src/lib/glossary.ts (no changes to source file).

🤖 Generated with Claude Code

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