fix(prompt-gate): pin duplicate prompt dispatches

Keep prompt reservations briefly after successful dispatch so rapid idle/message/error transitions cannot inject the same follow-up twice.

Route all production session prompt calls through the shared gate, restore skipped background resume state, release holds after abort/recovery paths, and preserve Ralph/ULW loop state when a dispatch is deferred.

Add regression coverage for session routing, static prompt route auditing, team-mode live messaging, model suggestion retries, call-omo-agent reuse, background parent wakes, runtime fallback, compaction recovery, Atlas, and Ralph/ULW loops.

src/hooks/ralph-loop/ralph-loop-event-handler.ts

@@ -2,6 +2,7 @@ import type { PluginInput } from "@opencode-ai/plugin"
 import { log } from "../../shared/logger"
 import { resolveMessageEventSessionID, resolveSessionEventID } from "../../shared/event-session-id"
 import { isSessionActive } from "../shared/session-idle-settle"
+import { releasePromptAsyncReservation } from "../shared/prompt-async-gate"
 import type { IterationCommitExpectation, RalphLoopOptions, RalphLoopState } from "./types"
 import { HOOK_NAME } from "./constants"
 import { handleDetectedCompletion } from "./completion-handler"
@@ -196,6 +197,7 @@ export function createRalphLoopEventHandler(
 		const props = event.properties as Record<string, unknown> | undefined
 		const runtimeRetryActivitySessionID = getRuntimeRetryActivitySessionID(event.type, props)
 		if (runtimeRetryActivitySessionID) {
+			releasePromptAsyncReservation(runtimeRetryActivitySessionID, "ralph-loop:activity")
 			runtimeErrorRetriedSessions.delete(runtimeRetryActivitySessionID)
 			recentHandledSyntheticIdleAt.delete(runtimeRetryActivitySessionID)
 		}
@@ -396,6 +398,10 @@ export function createRalphLoopEventHandler(
 					}
 					return
 				}
+				if (result.status === "dispatch_deferred") {
+					log(`[${HOOK_NAME}] Dispatch deferred`, { sessionID, reason: result.reason })
+					return
+				}
 
 				log(`[${HOOK_NAME}] Dispatch failed`, { sessionID, status: result.status })
 				options.loopState.clear()
@@ -563,6 +569,10 @@ export function createRalphLoopEventHandler(
 					}
 					return
 				}
+				if (result.status === "dispatch_deferred") {
+					log(`[${HOOK_NAME}] Dispatch deferred after runtime error`, { sessionID, reason: result.reason })
+					return
+				}
 
 				log(`[${HOOK_NAME}] Dispatch failed after runtime error`, { sessionID, status: result.status })
 				options.loopState.clear()