feat(FN-5064): merge fusion/fn-5064

packages/core/src/settings-schema.ts

@@ -285,6 +285,7 @@ export const DEFAULT_PROJECT_SETTINGS = {
   stalePausedReviewThresholdMs: 24 * 60 * 60_000,
   pausedScopeDecayMs: 30 * 60_000,
   metaTaskStallAutoCloseMs: 2 * 60 * 60_000,
+  metaTaskActiveExecutionGraceMs: 30 * 60_000,
   boardStallSweepWindowMs: 2 * 60 * 60_000,
   boardStallBlockedGrowthThreshold: 3,
   // Capacity risk warning default: only warn once todo is meaningfully backlogged.

packages/core/src/types.ts

@@ -2950,6 +2950,10 @@ export interface ProjectSettings {
    *  advancing before self-healing auto-archives it as superseded.
    *  Default: 7200000 (2 hours). Set to 0 to disable. */
   metaTaskStallAutoCloseMs?: number;
+  /** Grace period in milliseconds used by meta-task auto-archive guards to treat
+   *  recent executor activity as in-flight and skip destructive auto-archive.
+   *  Default: 1800000 (30 minutes). Set to 0 to disable this guard. */
+  metaTaskActiveExecutionGraceMs?: number;
   /** Rolling window in milliseconds for board-stall auto-recovery evaluation.
    *  Default: 7200000 (2 hours). */
   boardStallSweepWindowMs?: number;