Remove sync-related files not needed in this PR

These files (.github/workflows/pull-from-public.yml, .github/workflows/push-to-public.yml, SYNC_STRATEGY.md) were added by mistake and are not related to the memory cookbook context editing changes.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: zealoushacker