test: add E2E tests for comments and community updates
Add true E2E integration tests that verify the full write-forward flow
through real PDS and Jetstream infrastructure:
- Comment E2E tests: create, update, delete with real Jetstream indexing
- Comment authorization tests: verify users cannot modify others' comments
- Comment validation tests: verify proper error handling
- Community update E2E tests: single and multiple updates via Jetstream
These tests require dev infrastructure (make dev-up) and are skipped
in short mode. Fixed race condition where Jetstream subscription started
after create event was emitted.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>