The compacted event handler injected a system-tagged reminder into the
live query after SDK auto-compaction, which caused the agent to send
an unintended message. Reverts the four changes from #2327:
- Remove `compacted` variant from ProviderEvent union
- Restore `result` yield for compact_boundary in ClaudeProvider
- Remove compacted event handler and getAllDestinations import in poll-loop
- Remove compaction integration tests and CompactingProvider helper
Closes#2325 differently — the reminder approach is not viable.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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