Update dev origin allowlist and tests to use port 3100 only, matching the unified dev server setup. Fix AGENTS.md and README accordingly. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Update dev origin allowlist and tests to use port 3100 only, matching the unified dev server setup. Fix AGENTS.md and README accordingly. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>