Phase 15: wire mid-turn steer delivery on session_compact defer path

When agent is not idle after auto compaction, deliver pending reinject
immediately via steer instead of waiting for before_agent_start.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/index.ts

@@ -24,6 +24,7 @@ import {
 import {
 	applyPendingReinjectAfterCompact,
 	clearPendingReinjectOnUserPrompt,
+	deliverDeferredReinjectSteer,
 	planDeferredReinject,
 	planReinject,
 	sendImmediateReinjectAllFollowUp,
@@ -101,6 +102,8 @@ export default function skillReinject(pi: ExtensionAPI): void {
 		const skills = resolveRegisteredSkills(ctx.cwd, registeredSkills);
 		const branch = ctx.sessionManager.getBranch();
 		compactionRuntime.lastCompactionFirstKeptEntryId = event.compactionEntry.firstKeptEntryId;
+		compactionRuntime.lastCompactionEntryId = event.compactionEntry.id;
+		compactionRuntime.deferredDeliveredForCompactionId = null;
 		const trackedNames = state.skills.map((skill) => skill.name);
 		const keptEntries = getKeptEntries(branch, event.compactionEntry.firstKeptEntryId);
 		const keptPresent = skillsPresentInKeptWindow(keptEntries, trackedNames);
@@ -126,6 +129,17 @@ export default function skillReinject(pi: ExtensionAPI): void {
 		);
 
 		if (deliveryMode === "defer") {
+			if (shouldReinject && planned.length > 0 && !ctx.isIdle()) {
+				deliverDeferredReinjectSteer(
+					pi,
+					state,
+					settings,
+					skills,
+					compactionRuntime,
+					event.compactionEntry.id,
+					ctx,
+				);
+			}
 			persistState();
 			return;
 		}