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Steps 4 and 5 of PLANS/BUZZ_OPERATIONS_MIGRATION.md. Behaviour is unchanged: steer.rs, cancel.rs and the real-MCP integration tests all pass without modification. BuzzSteerOperation drains the steer queue; BuzzCompactionOperation wraps goose's check_if_compaction_needed/compact_messages plus the _PostCompact re-injection that buzz's old context handoff existed for. These need a second StateMachine (round_start), not more steps on the existing one: round_gate also runs when a turn wants to END, and draining steers or compacting there would change when they happen. Since step() stops at the first operation that applies, the start machine runs to exhaustion -- a turn that both steers and compacts needs two passes. The gate now carries StateEffect rather than Message, because compaction replaces the conversation instead of appending to it. apply_effects reports whether state actually changed, which is what stops a no-op-applied operation from spinning the loop. Not goose's CompactionOperation: it yields to the client and emits a user-facing notification. In buzz a yield ends the turn, and the notification would post 'compacting' into the channel -- so a long conversation would stop mid-work and narrate its own housekeeping. Nearly dropped the [PostCompact] prefix on the re-injected state while moving it. Caught by re-reading the old function before deleting it; the model uses that prefix to tell re-injected state from a user turn. 74 unit + 21 integration green, handtest --all 18/18. Signed-off-by: Michael Neale <michael.neale@gmail.com> Co-authored-by: Michael Neale <michael.neale@gmail.com>