say which harness owns a chat row, on both kinds

The list is merged from two stores and only OpenCode rows were badged, so Claude was marked by
the ABSENCE of a badge — legible only if you already knew the list mixes two harnesses. Both
carry one now, and since `harness` is absent on older Claude rows, anything not OpenCode reads
as Claude, matching the server's own default.

The badge no longer replaces the message count, it sits before it: the count is real on Claude
rows and a hardcoded 0 on OpenCode ones (the session list has no count field and a real one
costs an HTTP call per row), so those rows show the badge and no count rather than a zero that
means "never asked".

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/workspaces/officerdev/src/apps/ChatHistory/SessionList.tsx

@@ -10,6 +10,24 @@ import type { SelectedSession } from './ChatDetailPanel';
 import { chatListPath, chatNewPath, chatSessionPath, cwdFromSplat } from './chat-routes';
 import { PwdSelector } from './PwdSelector';
 
+/**
+ * Which agent owns a conversation, said on EVERY row.
+ *
+ * Only OpenCode rows carried a badge before, which marks one harness and leaves the other inferred from
+ * its absence — fine when you already know the list mixes two, useless when you don't. The list is
+ * merged from two stores (Claude transcripts, OpenCode's session db) and the harness decides where a
+ * reply is dispatched, so it is a property of the row, not a footnote on the odd one out.
+ *
+ * `harness` is absent on older Claude rows, so anything that is not OpenCode reads as Claude — the same
+ * default the server applies.
+ */
+const HarnessBadge = ({ harness }: { harness?: 'claude' | 'opencode' }) =>
+  harness === 'opencode' ? (
+    <span className="rounded bg-info/10 px-1.5 py-0.5 font-medium text-info">OpenCode</span>
+  ) : (
+    <span className="rounded bg-primary/10 px-1.5 py-0.5 font-medium text-primary">Claude</span>
+  );
+
 // Reads the /chat conversation list from Claude's own transcript store (source of truth).
 // Clicking a session loads its transcript and continues the real Claude session via --resume.
 export const SessionList = () => {
@@ -194,13 +212,14 @@ export const SessionList = () => {
                     className="min-w-0 flex-1"
                     meta={[
                       <RelativeTime key="t" value={session.updatedAt} />,
-                      session.harness === 'opencode' ? (
+                      <HarnessBadge key="h" harness={session.harness} />,
-                        <span key="h" className="rounded bg-info/10 px-1.5 py-0.5 font-medium text-info">
+                      // Claude's transcripts give a real turn count. OpenCode's session list has no
-                          OpenCode
+                      // count field, so the number on those rows is a hardcoded 0 and costs an HTTP
-                        </span>
+                      // call per row to make real — the badge stands in its place rather than beside a
-                      ) : (
+                      // zero that means "not asked".
-                        `${session.messageCount} msg${session.messageCount === 1 ? '' : 's'}`
+                      session.harness === 'opencode'
-                      ),
+                        ? null
+                        : `${session.messageCount} msg${session.messageCount === 1 ? '' : 's'}`,
                       // One row, several transcripts: this conversation was `/clear`ed and carried on,
                       // and the server has spliced the parts back together. Worth saying out loud —
                       // the message count above covers all of them, and opening the row shows all of