fix: preserve unexpected provider finish reasons

packages/opencode/test/kilocode/session-generation-id.test.ts

@@ -0,0 +1,23 @@
+import { describe, expect, test } from "bun:test"
+import { KiloSessionProcessor } from "../../src/kilocode/session/processor"
+
+describe("session generation id", () => {
+  test("extracts a bounded Gateway generation id", () => {
+    expect(
+      KiloSessionProcessor.generationID({
+        gateway: {
+          generationId: " gen_test-123 ",
+          routing: { finalProvider: "novita" },
+          marketCost: "0.1",
+        },
+      }),
+    ).toBe("gen_test-123")
+  })
+
+  test("rejects arbitrary or oversized metadata values", () => {
+    expect(KiloSessionProcessor.generationID({ gateway: { generationId: "request-secret" } })).toBeUndefined()
+    expect(KiloSessionProcessor.generationID({ gateway: { generationId: `gen_${"a".repeat(201)}` } })).toBeUndefined()
+    expect(KiloSessionProcessor.generationID({ gateway: { generationId: 42 } })).toBeUndefined()
+    expect(KiloSessionProcessor.generationID({ openai: { responseId: "gen_response" } })).toBeUndefined()
+  })
+})

packages/opencode/test/kilocode/session-processor-empty-tool-calls.test.ts

@@ -577,7 +577,14 @@ describe("session processor empty tool-calls", () => {
               index: 0,
               reason: "stop",
               usage: usage(),
-              providerMetadata: { kilocode: { routedModelID: "openai/gpt-5.5-20260423" } },
+              providerMetadata: {
+                kilocode: { routedModelID: "openai/gpt-5.5-20260423" },
+                gateway: {
+                  generationId: "gen_test",
+                  routing: { finalProvider: "openai" },
+                  marketCost: "0.1",
+                },
+              },
             }),
             LLMEvent.finish({ reason: "stop", usage: usage() }),
           )
@@ -632,6 +639,9 @@ describe("session processor empty tool-calls", () => {
             providerID: selection.providerID,
             modelID: ModelV2.ID.make("openai/gpt-5.5-20260423"),
           })
+          expect(part?.generationID).toBe("gen_test")
+          expect(part).not.toHaveProperty("providerMetadata")
+          expect(part).not.toHaveProperty("gateway")
         }),
       { git: true },
     ),

packages/opencode/test/session/llm.test.ts

@@ -281,7 +281,7 @@ describe("session.llm.ai-sdk adapter", () => {
       {
         type: "step-finish",
         index: 0,
-        reason: "unknown",
+        reason: "other", // kilocode_change
         usage: {
           inputTokens: 10,
           outputTokens: 5,
@@ -294,7 +294,7 @@ describe("session.llm.ai-sdk adapter", () => {
       },
       {
         type: "finish",
-        reason: "unknown",
+        reason: "other", // kilocode_change
         usage: {
           inputTokens: 11,
           outputTokens: 6,