v0.6.1: placed maps stay placed
Two fixes from the demo-recording session on issue #6:
- AR free-fly is locked to scope-style movement when hit-test placement is available, so a scope parked on real furniture stays there. Headsets without hit-test keep free-fly for manual positioning.
- Headset performance in busy airspace: trails render at half density (capped to the most recent 300 points) while presenting, cutting the dominant geometry load. An
[xr] perfconsole line every 5 seconds reports frame time and draw calls for further tuning.
Full details in CHANGELOG.md.