feat(router): replace bare refusal with triage directive in system prompt

testing/deterministic/src/test/kotlin/RouterContextBuilderTest.kt

@@ -130,7 +130,8 @@ class RouterContextBuilderTest {
             ),
         )
         // Budget allows L0 + 2 long conversation turns; oldest 2 turns are dropped
-        val pack = runBlocking { builderWide.build(state, TokenBudget(limit = 500)) }
+        // Budget increased from 500 to 600 to account for larger system prompt with triage directive
+        val pack = runBlocking { builderWide.build(state, TokenBudget(limit = 600)) }
         val l1Entries = pack.layers[ContextLayer.L1] ?: emptyList()
         // Only the last 2 turns (oldest-first drop) should remain
         assertEquals(2, l1Entries.size)
@@ -841,6 +842,15 @@ class RouterContextBuilderTest {
         assertNull((pack.layers[ContextLayer.L0] ?: emptyList()).find { it.sourceType == "projectProfile" })
     }
 
+    @Test
+    fun `system prompt contains triage directive not bare refusal`() {
+        val pack = buildPack(RouterState(), TokenBudget(limit = 10000))
+        val content = pack.layers[ContextLayer.L0]?.find { it.sourceType == "systemPrompt" }!!.content
+        assertFalse(content.contains("if something is not in context, say you do not have it"))
+        assertTrue(content.contains("Available workflows", ignoreCase = true))
+        assertTrue(content.contains("project profile", ignoreCase = true))
+    }
+
     @Test
     fun `truncatedLayers populated with affected layers when drops occur`() {
         val longText = "x".repeat(800)