RoboLab v0.1.1

Added

• Cosmos3 policy client; refreshed DreamZero, GR00T, and Pi0-family clients.
• Results dashboard (robolab-dashboard CLI).
• /robolab-scenegen and /robolab-taskgen Claude Code skills.
• Convex-hull placement predicates, adaptive sampling, and DROID IK control.
• CONTRIBUTING.md and a uv-based install flow.

Changed

• Per-policy reorganization: one runner per backend under
  policies/<policy>/run.py.
• Docs revamp: per-policy READMEs, SPDX headers, THIRD_PARTY_NOTICES.md.
• Episode videos encoded as streaming H.264 (libx264) so they play in
  browsers.

Fixed

• Placement order enforced in then-sequenced tasks.
• Frozen-env data leaks in the episode recorder.