fix(ralph-loop): revalidate ownership and harden commit/session-creation failures

Three correctness fixes on top of the dispatch-before-commit invariant:

- ralph-loop-event-handler.ts: after idleSettleMs, also require state ownership and non-verification-pending to match the event source before dispatching. Applied to both the session.idle and session.error retry paths.
- verification-failure-handler.ts: if incrementIteration fails after a successful continuation injection, clear the loop state and emit a warning toast instead of returning success.
- session-reset-strategy.ts: catch thrown session.create errors so they route through the typed session_creation_rejected path instead of surfacing as an unhandled rejection.

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

@@ -278,6 +278,17 @@ export function createRalphLoopEventHandler(
 				if (!stateAfterSettle || !stateAfterSettle.active) {
 					return
 				}
+				if (stateAfterSettle.session_id !== undefined && stateAfterSettle.session_id !== sessionID) {
+					log(`[${HOOK_NAME}] Skipped: state rebound during settle window`, {
+						sessionID,
+						currentOwner: stateAfterSettle.session_id,
+					})
+					return
+				}
+				if (stateAfterSettle.verification_pending) {
+					log(`[${HOOK_NAME}] Skipped: state entered verification_pending during settle window`, { sessionID })
+					return
+				}
 
 				const nextIteration = stateAfterSettle.iteration + 1
 				const previewState: RalphLoopState = { ...stateAfterSettle, iteration: nextIteration }
@@ -401,6 +412,17 @@ export function createRalphLoopEventHandler(
 				if (!stateAfterSettle || !stateAfterSettle.active) {
 					return
 				}
+				if (stateAfterSettle.session_id !== undefined && stateAfterSettle.session_id !== sessionID) {
+					log(`[${HOOK_NAME}] Skipped: state rebound during settle window`, {
+						sessionID,
+						currentOwner: stateAfterSettle.session_id,
+					})
+					return
+				}
+				if (stateAfterSettle.verification_pending) {
+					log(`[${HOOK_NAME}] Skipped: state entered verification_pending during settle window`, { sessionID })
+					return
+				}
 
 				const nextIteration = stateAfterSettle.iteration + 1
 				const previewState: RalphLoopState = { ...stateAfterSettle, iteration: nextIteration }

src/hooks/ralph-loop/session-reset-strategy.ts

@@ -7,6 +7,7 @@ export async function createIterationSession(
   parentSessionID: string,
   directory: string,
 ): Promise<string | null> {
+  try {
     const createResult = await ctx.client.session.create({
       body: {
         parentID: parentSessionID,
@@ -24,6 +25,13 @@ export async function createIterationSession(
     }
 
     return createResult.data.id
+  } catch (error: unknown) {
+    log("[ralph-loop] session.create threw during iteration session creation", {
+      parentSessionID,
+      error: String(error),
+    })
+    return null
+  }
 }
 
 export async function selectSessionInTui(

src/hooks/ralph-loop/verification-failure-handler.ts

@@ -122,6 +122,14 @@ export async function handleFailedVerification(
 	const committed = loopState.incrementIteration()
 	if (!committed) {
 		log(`[${HOOK_NAME}] Failed to commit iteration after verification restart`, { parentSessionID })
+		loopState.clear()
+		showToastBestEffort(ctx, {
+			title: "Ralph Loop Failed",
+			message: "Verification continuation dispatched but iteration commit failed",
+			variant: "warning",
+			duration: 5000,
+		})
+		return false
 	}
 
 	await ctx.client.tui?.showToast?.({