Phase 12: recalculate pending on each compact — SPEC §16.6.

Every session_compact replans pendingReinject in defer mode; skipped reinject clears the queue unless manual compaction is waiting for the next user prompt.

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

src/reinject.ts

@@ -96,6 +96,25 @@ export function enqueueDeferredReinjectFromCompact(
 	);
 }
 
+/**
+ * Update pending queue after session_compact; each compact recalculates or clears (SPEC §16.6).
+ * Manual compaction with default settings keeps stale pending until the next user prompt.
+ */
+export function applyPendingReinjectAfterCompact(
+	state: ExtensionState,
+	compactionRuntime: CompactionRuntime,
+	shouldReinject: boolean,
+	planned: readonly string[],
+): void {
+	if (shouldReinject) {
+		state.pendingReinject = [...planned];
+		return;
+	}
+	if (!compactionRuntime.clearPendingReinjectOnNextUserInput) {
+		state.pendingReinject = [];
+	}
+}
+
 /** Warn when re-injecting many skills; unlimited by default with soft warn above 3 (SPEC §15). */
 export function maybeWarnManySkills(
 	skillCount: number,