more opencode fixes

main_test.go

@@ -1147,11 +1147,13 @@ func TestCol(t *testing.T) {
 // ---------- llm / AL / summarize / compact via httptest (no real network) ----------
 
 func TestLLMNonStreamingAndHeaders(t *testing.T) {
-  var gotPath, gotAuth, gotUA string
+  var gotPath, gotAuth, gotUA, gotOCClient, gotOCSession string
   srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
     gotPath = r.URL.Path
     gotAuth = r.Header.Get("Authorization")
     gotUA = r.Header.Get("User-Agent")
+    gotOCClient = r.Header.Get("x-opencode-client")
+    gotOCSession = r.Header.Get("x-opencode-session")
     w.Write([]byte(`{"choices":[{"message":{"role":"assistant","content":"hi","reasoning_content":"think"}}]}`))
   }))
   defer srv.Close()
@@ -1173,11 +1175,32 @@ func TestLLMNonStreamingAndHeaders(t *testing.T) {
   if !strings.Contains(gotUA, "opencode/1.18.31") {
     t.Errorf("user-agent = %q", gotUA)
   }
+  if gotOCClient != "cli" {
+    t.Errorf("x-opencode-client = %q, want cli", gotOCClient)
+  }
+  if gotOCSession != opencodeSessionID() {
+    t.Errorf("x-opencode-session = %q, want %q", gotOCSession, opencodeSessionID())
+  }
   if m.Content == nil || *m.Content != "hi" || m.ReasoningContent != "think" {
     t.Errorf("message = %+v", m)
   }
 }
 
+func TestOpencodeSessionID(t *testing.T) {
+  sid := opencodeSessionID()
+  if !strings.HasPrefix(sid, "ses_") {
+    t.Fatalf("session id does not start with ses_: %q", sid)
+  }
+  if len(sid) != 30 {
+    t.Fatalf("session id length = %d, want 30: %q", len(sid), sid)
+  }
+  for _, c := range sid[4:] {
+    if !((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
+      t.Fatalf("invalid character %c in session id %q", c, sid)
+    }
+  }
+}
+
 func TestLLMNoAuthHeaderWhenNoKey(t *testing.T) {
   var gotAuth string
   srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {