[signup-agent] Model-reported signup issues

A scheduled agent review reported issues in the signup flow.

Run: https://github.com/BuilderIO/agent-native/actions/runs/34382429631

### beta crm

The email sign-in flow completes and lands the user in the correct CRM app with a working dashboard, but a background API call fails with a 500 error on every load.

| Severity | Step | Issue | Evidence |
| --- | --- | --- | --- |
| medium | after following the emailed link / after a browser reload | The /_agent-native/org/me endpoint returns a 500 error on both the initial post-link load and again after a browser reload, indicating a persistent backend failure fetching organization/account data for the signed-in user. | network events show '500 /_agent-native/org/me 5040ms' after the emailed link, and '500 /_agent-native/org/me 317ms' and another '500 /_agent-native/org/me 315ms' after the reload. |

This lane is advisory: it never fails a build and never pages. Close this issue once the findings are triaged.

Start with the linked GitHub Actions run and the network evidence for /_agent-native/org/me during the emailed-link load and browser reload. Trace the signup request path to identify why the endpoint returns 500, then document the triage outcome and close the issue once the finding has been triaged.

Written by the indexing model from the issue text.