A community based topic aggregation platform built on atproto

docs: update documentation for completed namespace migration master

Update COMMENT_SYSTEM_IMPLEMENTATION.md to reflect the completed migration from social.coves.feed.comment to social.coves.community.comment. Changes: - Mark Phase 4 (Namespace Migration) as COMPLETED (2025-11-16) - Update all namespace references throughout the document - Add migration completion details and scope Documentation now accurately reflects the current implementation using the community.comment namespace for all comment records. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>


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