fix(providers): link omo panes resumed with --session-id to their sessions

server/modules/providers/services/external-cli-sessions.service.ts

@@ -44,6 +44,11 @@ const CURSOR_RESUME_SESSION_RE = /(?:^|\s)(?:--resume|resume)(?:=|\s+)([A-Za-z0-
 const OPENCODE_SESSION_RE = /(?:^|\s)--session(?:=|\s+)([A-Za-z0-9_-]{8,128})(?=\s|$)/;
 // Oh My Pi and omo are both pi-derived and accept the identical `--resume|-r` form.
 const PI_RESUME_SESSION_RE = /(?:^|\s)(?:--resume|-r)(?:=|\s+)([A-Za-z0-9_-]{8,128})(?=\s|$)/;
+// omo's canonical continuation flag is `--session-id <id>` (its `--resume` takes
+// no value and opens a picker, so no id ever appears in argv for that form).
+// ChatMux itself resumes omo with `--session-id` in `server/pi-cli.ts`, so a
+// pane started that way must link back to its transcript session.
+const OMO_SESSION_ID_RE = /(?:^|\s)--session-id(?:=|\s+)([A-Za-z0-9_-]{8,128})(?=\s|$)/;
 const TRANSCRIPT_FILE_SESSION_ID_RE = /_([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})\.jsonl$/i;
 const CODEX_ROLLOUT_FILE_RE = /^rollout-.*-([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})\.jsonl$/i;
 const MAX_RUNTIME_DESCRIPTORS = 2_048;
@@ -202,7 +207,12 @@ export function extractExternalResumeSessionId(
   if (kind === 'codex') return extractCodexResumeThreadId(processArgs);
   if (kind === 'cursor') return processArgs.match(CURSOR_RESUME_SESSION_RE)?.[1] ?? null;
   if (kind === 'opencode') return processArgs.match(OPENCODE_SESSION_RE)?.[1] ?? null;
-  if (kind === 'omp' || kind === 'omo') return processArgs.match(PI_RESUME_SESSION_RE)?.[1] ?? null;
+  if (kind === 'omp') return processArgs.match(PI_RESUME_SESSION_RE)?.[1] ?? null;
+  if (kind === 'omo') {
+    return processArgs.match(OMO_SESSION_ID_RE)?.[1]
+      ?? processArgs.match(PI_RESUME_SESSION_RE)?.[1]
+      ?? null;
+  }
   return null;
 }
 

server/modules/providers/tests/external-cli-sessions.service.test.ts

@@ -754,6 +754,27 @@ test('extractExternalResumeSessionId recognizes every supported native resume fo
   assert.equal(extractExternalResumeSessionId('cursor', 'agent --version'), null);
 });
 
+// omo continues a session with `--session-id <id>` — the flag ChatMux itself
+// uses in `server/pi-cli.ts`. Its `--resume` takes no value (interactive
+// picker), so a pane resumed with `--session-id` must still link back to its
+// transcript session.
+test('extractExternalResumeSessionId links omo panes started with --session-id', () => {
+  assert.equal(
+    extractExternalResumeSessionId('omo', 'omo --session-id 019ff9fa-abab-78a3-83b0-67c261374f42'),
+    '019ff9fa-abab-78a3-83b0-67c261374f42',
+  );
+  assert.equal(
+    extractExternalResumeSessionId('omo', 'node /home/user/bin/omo --session-id=019ff9fa-abab-78a3-83b0-67c261374f42'),
+    '019ff9fa-abab-78a3-83b0-67c261374f42',
+  );
+  // pi-derived `--resume <id>` argv still links if a wrapper passes it through.
+  assert.equal(extractExternalResumeSessionId('omo', 'omo --resume 019f848f_ff71_77f0'), '019f848f_ff71_77f0');
+  // The valueless picker form carries no id and must not match the prompt text.
+  assert.equal(extractExternalResumeSessionId('omo', 'omo --resume'), null);
+  // `--session-id` must never leak into the omp branch, which has no such flag.
+  assert.equal(extractExternalResumeSessionId('omp', 'omp --session-id 019f848f_ff71_77f0'), null);
+});
+
 
 test('parseClaudeRuntimeSession accepts the PID-bound native Claude receipt', () => {
   const sessionId = '92869134-b4df-453e-b3a6-ed1d750d69d9';