Settle OpenCode completion before ending its turn

Keep controller acceptance, inner result and tool feedback consistent during idle, error, abort, close and interruption. Reject concurrent finishing calls before controller admission. Preserve the stopped zero-provider campaign and qualify only a fresh bounded source.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

doc/plans/2026-10-04-native-completion-answer-fix.md

@@ -19,3 +19,5 @@ The receipt-only correction at `be604fcbf81ff238ee38774ff6e644bf0d84eb2d` failed
 OpenCode's inner driver admitted the finishing report locally without invoking the controller feedback handler. Its proxy also discarded the controller response envelope, including the success flag. The correction forwards the exact terminal call ID, thread, turn, tool and structured result through the existing controller request channel. It waits for the controller before committing the inner result, preserves accepted response text and concrete rejection reasons, and rejects malformed acceptance or a turn that ended during feedback. Dynamic-tool unwrapping stays unchanged. A provider-free test crosses the real runnerd, proxy and fake OpenCode boundary: the first completion is rejected, the provider corrects it in the same turn, the second receives the exact final-response feedback, and only one semantic result is proposed.
 
 This correction changes four additional OpenCode-only production paths. The shared instruction, server receipt/feedback and UI bytes remain identical to 3a7349d. Admit the new source and measure all scripted boundaries again. Confirm only the two affected OpenCode live cases on the new immutable source, one attempt each with the original model, deadlines and budget stops. Keep the four passing Claude/Codex observations explicitly attributed to 3a7349d, backed by the exact provider-path delta and final-head CI. Do not relabel them as live runs on the new head. No new baseline or unchanged-source paid retry is included.
+
+The e171282 confirmation campaign 37257534042 was stopped during build after fresh review identified a controller/inner-session acceptance race. No paid step started and no provider was executed. Provider-free regression reproduces accepted feedback losing its result when idle/error arrives in flight. Completion settlement now holds terminal mapping, explicit interruption and close until the bound decision and tool result finish, and refuses a concurrent terminal submission before invoking the controller. Raw SSE frames remain retained at receipt; normalized terminal settlement follows the finishing decision. Confirm the same two OpenCode cases only on the newly admitted immutable source; preserve e171282's completed failing review and zero-provider campaign.