A community based topic aggregation platform built on atproto

test(lexicon): update validation tests for post records master

Update lexicon validation tests to handle post record types: - Add social.coves.post.record to test cases - Verify at-identifier format for community field - Validate author field (required DID) Ensures lexicon validation works correctly for new post records. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>


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