fix(session): accept legacy summary diffs (#26579)

Co-authored-by: Developer <temp@example.com>

packages/opencode/test/server/httpapi-session.test.ts

@@ -297,6 +297,36 @@ describe("session HttpApi", () => {
     ),
   )
 
+  it.live(
+    "serves sessions with migrated summary diffs missing file details",
+    withTmp({ git: true, config: { formatter: false, lsp: false } }, (tmp) =>
+      Effect.gen(function* () {
+        const session = yield* createSession(tmp.path, { title: "legacy diff" })
+        yield* Effect.sync(() =>
+          Database.use((db) =>
+            db
+              .update(SessionTable)
+              .set({
+                summary_additions: 1,
+                summary_deletions: 0,
+                summary_files: 1,
+                summary_diffs: [{ additions: 1, deletions: 0 }],
+              })
+              .where(eq(SessionTable.id, session.id))
+              .run(),
+          ),
+        )
+
+        const response = yield* request(pathFor(SessionPaths.get, { sessionID: session.id }), {
+          headers: { "x-opencode-directory": tmp.path },
+        })
+
+        expect(response.status).toBe(200)
+        expect((yield* json<Session.Info>(response)).summary?.diffs).toEqual([{ additions: 1, deletions: 0 }])
+      }),
+    ),
+  )
+
   it.live(
     "serves lifecycle mutation routes",
     withTmp({ git: true, config: { formatter: false, lsp: false, share: "disabled" } }, (tmp) =>

packages/opencode/test/session/schema-decoding.test.ts

@@ -83,6 +83,26 @@ describe("Session.Info", () => {
     expect(Session.Info.zod.parse(input)).toEqual(input)
   })
 
+  test("accepts migrated summary diffs without file details", () => {
+    const input = {
+      id: sessionID,
+      slug: "legacy-diff",
+      projectID,
+      directory: "/tmp/proj",
+      title: "Legacy diff",
+      version: "0.1.0",
+      summary: {
+        additions: 1,
+        deletions: 0,
+        files: 1,
+        diffs: [{ additions: 1, deletions: 0 }],
+      },
+      time: { created: 1, updated: 2 },
+    }
+    expect(decode(input)).toEqual(input)
+    expect(Session.Info.zod.parse(input)).toEqual(input)
+  })
+
   test("rejects unbranded session id", () => {
     const bad = { id: "not-a-session-id" } as unknown
     expect(() => decode(bad)).toThrow()

packages/opencode/test/session/snapshot-tool-race.test.ts

@@ -238,7 +238,7 @@ it.live("tool execution produces non-empty session diff (snapshot race)", () =>
       expect(tool?.state.status).toBe("completed")
 
       // Poll for diff — summarize() is fire-and-forget
-      let diff: Array<{ file: string }> = []
+      let diff: Array<{ file?: string }> = []
       for (let i = 0; i < 50; i++) {
         diff = yield* summary.diff({ sessionID: session.id })
         if (diff.length > 0) break