fix(remote): address review feedback on omp/claude respawn continuity

- Remote omp command now renders through buildSpawnCommandFromRegistry
  (the mode-agnostic engine local/docker spawns use) instead of the
  buildOmpCommand() the CLI-registry refactor deleted.
- Session._pinOmpRespawnId()/_maybeCaptureOmpSessionId() now skip
  host-local ~/.omp resolution entirely for a remote session and fall
  back to --continue: that resolver only ever reads THIS host's
  filesystem, which is meaningless (and could wrongly alias an
  unrelated local conversation) for a conversation that lives on the
  remote host.
- Remote-claude launch now honors an explicit resumeSessionId distinct
  from sessionId (mirrors claudeDockerPaneCommand's shape), and
  validates sessionId the same way that sibling does before
  interpolating it into the remote shell command.
- Add the still-missing header-cwd half of the trailing-slash test,
  and document respawn/reattach continuation + auto-reconnect-vs-
  clean-exit in docs/remote-sessions.md.

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

test/tmux-manager.test.ts

@@ -187,6 +187,28 @@ describe('TmuxManager (unit)', () => {
       expect(command).toContain('claude --dangerously-skip-permissions --session-id abc123def456');
       expect(command).toContain('claude --dangerously-skip-permissions --resume abc123def456');
     });
+
+    it('resumes an explicit resumeSessionId distinct from sessionId (mirrors claudeDockerPaneCommand)', () => {
+      // The docker-claude builder (claudeDockerPaneCommand) has always handled a
+      // resumeId that differs from sessionId — e.g. a resume-from-history launch —
+      // by leading with `--resume <rid> || --session-id <sessionId>`. The remote
+      // claude branch used to only mirror the SAME-id fallback shape and silently
+      // dropped a distinct resumeSessionId, so a remote resume-from-history claude
+      // launch created a brand-new conversation instead of resuming the named one.
+      const command = buildRemoteLaunchCommand({
+        mode: 'claude',
+        remote: { hostId: 'gpu-box', label: 'GPU Box', host: '10.0.0.42', username: 'ubuntu', remotePath: '/w' },
+        sessionId: 'abc123def456',
+        resumeSessionId: 'old-conversation-uuid',
+      });
+      expect(command).toContain('claude --dangerously-skip-permissions --resume old-conversation-uuid');
+      expect(command).toContain('claude --dangerously-skip-permissions --session-id abc123def456');
+      // The resume attempt must lead — session-id is the fallback here, reversed
+      // from the same-id case.
+      const resumeIdx = command.indexOf('--resume old-conversation-uuid');
+      const sessionIdIdx = command.indexOf('--session-id abc123def456');
+      expect(resumeIdx).toBeLessThan(sessionIdIdx);
+    });
   });
 
   describe('remote kill command builder', () => {