RoboLab v0.2.1

Added

• Faithful replay of recorded episodes: new robolab/core/replay/ module with
  recorded env-config overlay, initial-state restore, and per-step state
  validation; driver script examples/run_recorded.py; user guide
  docs/replay.md. (#19)
• Batched inference support in the eval client interface.
• The pytest install-verification suite now ships in tests/ (documented
  fresh-install check: uv run pytest tests/).

Changed

• Subtask progress tracking is enabled by default during evaluation.
• Updated the GR00T N1.7 client.
  (#15)
• Overrode isaacsim's stale websockets==12.0 pin so uv lock resolves a
  modern websockets for the policy clients.

Fixed

• WorldState extras handling on IsaacLab 2.3 (XformPrimView).