Improve whiteboard density and callouts

Fix current-source lessons and compact board layout

Enrich whiteboard diagrams and responsive board

Clarify orbit and gradient diagrams

Improve whiteboard diagram quality

text groups merge into notes blocks; curves must be shape-true in screen coords

profile personalizes, never vetoes: free topic switches, honest coach goals, notes clear on new lesson

no more slivers: min shape dims + vertical label fit

goal/start dots snap to the curve's actual lowest/highest point

board polish: highlights hug measured text, arrows chase displaced labels, hypotenuse label on longest side

fixes: shrink-to-fit shape labels, dark-mode-proof text, responsive stack, coach echo guard

v2: teacher's-studio design, MiniCPM5 planner+coach, expanding board, field notes

diagnostic: defer-phase timing logs

gemma artist: fit 59s budget — TTS overlaps stream, 3-4 steps, shorter renders

dual board artist: TUTORI_BOARD_MODEL=gemma mounts LoRA on the teacher (ZeroGPU-compatible)

nemotron: stop on <|im_end|> + first-balanced-JSON parse (model output verified good)

nemotron: enable_thinking=False to match tuned adapter training rendering

fix nemotron_generate: unwrap BatchEncoding from apply_chat_template (also un-breaks Nemotron planner)

debug: full traceback on board render failure

board model: mount LoRA adapter lazily inside GPU worker (ZeroGPU has no CUDA at import)

board-model experiment: flagged Nemotron LoRA board renderer (off by default)

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