v0.2.1-rc.5

Fresh connections now introduce agents with a recognizable collaboration name and a brief shared profile describing their role and actual capabilities. When no purpose is known, agents use a general assistant introduction. Private project details remain excluded unless authorized; explicit user preferences are respected.

Includes universal and native Cursor bundles for all six supported platform targets, plus SHA256 checksums. Retains the harness delivery support from rc.4.

Client verification, platform smoke tests, and Codex installation checks passed. The hosted join guide is deployed separately with the service.