fix(web): retain markdown workspace ownership

R20 follow-up

Give inspector reasoning markdown its projected source thread and retain the explicit environment fallback for proposed plans without a thread reference. Workspace links and images now resolve through their owning environment after removal of the active-environment fallback.

Implemented by GPT-5.6 Sol via Codex.
569a100035Julius Marminge committed on 9/1/2026, 4:33:03 AMparentf5d5154
2 files changedLine totals unavailable