Playtest 3.0.0-rc1: early release/camera/performance findings

[JoTalbot]

Latest physical verification

Build: 3.0.1
Device: 427×948 @1.0 (слабый)
Session: 2 min
FPS: 55
Heavy frames: 4
Native save: alive
Touches: 3; gaze 3; growth 2; drops 0; steps 1; void 0; pulses 0
Runtime render exceptions: 0
Visual spam: none
Save/restart recovery: passed

Current assessment

• Weak-device performance gate is now GREEN.
• The visual readability/text-spam blockers are resolved and closed in issues V3-030: stop visual text/verse spam from flooding the playfield #5 and V3-031: playfield readability regression on mobile #6.
• Camera remains stable from the observed run.
• No accidental drops occurred in this verification run.
• A first-session non-gaze interaction signal exists (steps: 1), but the 2-minute smoke was not designed as a full first-session UX study.

This issue remains open as a broader playtest/UX hardening backlog item rather than a current release blocker. It should not block the V3.0.1 RC gate unless a dedicated first-session funnel test reveals a critical regression.