Vijay Janapa Reddi c30f2a3bfd refactor: move mlsysim to repo root, extract fmt module from viz ...

Moves the mlsysim package from book/quarto/mlsysim/ to the repo root
so it is importable as a proper top-level package across the codebase.

Key changes:
- mlsysim/fmt.py: new top-level module for all formatting helpers (fmt,
  sci, check, md_math, fmt_full, fmt_split, etc.), moved out of viz/
- mlsysim/viz/__init__.py: now exports only plot utilities; dashboard.py
  (marimo-only) is no longer wildcard-exported and must be imported
  explicitly by marimo labs
- mlsysim/__init__.py: added `from . import fmt` and `from .core import
  constants`; removed broken `from .viz import plots as viz` alias
- execute-env.yml: fixed PYTHONPATH from "../../.." to "../.." so
  chapters resolve to repo root, not parent of repo
- 51 QMD files: updated `from mlsysim.viz import <fmt-fns>` to
  `from mlsysim.fmt import <fmt-fns>`
- book/quarto/mlsys/: legacy shadow package contents cleaned up;
  stub __init__.py remains for backward compat
- All Vol1 and Vol2 chapters verified to build with `binder build pdf`

2026-03-01 17:24:11 -05:00

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