v0.14.2

Fix

• A run's Session is now a plain durable Session (no origin: "subagent" header), so a finished agent run's conversation can be reopened from its run row instead of failing with session/agent-busy (#2, #4 by @ai-chase).
• The overlay's openSession re-pulls the host session list once when a settled run's id is no longer listed, then retries; ids that stay unknown fall back to the run-detail page.

Behaviour changes (accepted trade-offs)

• Run Sessions now appear in the workspace sidebar; high-frequency jobs accumulate entries.
• The host no longer refuses prompts to a running run's Session; a message typed mid-run joins the unattended run and may surface in its summary.
• Run Sessions persisted by earlier versions keep the old header and stay unopenable.