fix(narration): use plan_rejected kind and include source in instruction

apps/server/src/main/kotlin/com/correx/apps/server/narration/NarrationSubscriber.kt

@@ -68,7 +68,7 @@ class NarrationSubscriber(
             )
             is ExecutionPlanRejectedEvent -> enqueue(
                 sid,
-                NarrationTrigger(kind = "execution_plan_rejected", instruction = "The execution plan was rejected: ${p.reason}. Explain to the user what happened and what they can do next."),
+                NarrationTrigger(kind = "plan_rejected", instruction = "The execution plan was rejected (${p.source}): ${p.reason}. Explain to the user what happened and what they can do next."),
             )
             is OrchestrationPausedEvent -> enqueue(
                 sid,

apps/server/src/test/kotlin/com/correx/apps/server/narration/NarrationSubscriberTest.kt

@@ -221,10 +221,14 @@ class NarrationSubscriberTest {
         }
 
         assertEquals(1, facade.calls.size)
-        assertEquals("execution_plan_rejected", facade.calls[0].second.kind)
+        assertEquals("plan_rejected", facade.calls[0].second.kind)
         assertTrue(
             facade.calls[0].second.instruction.contains("Missing required artifact"),
             "instruction must include the rejection reason",
         )
+        assertTrue(
+            facade.calls[0].second.instruction.contains("missing_content"),
+            "instruction must include the source",
+        )
     }
 }