Prepare reproducible Fall 2026 notebooks and homework slate

[ebilionis]

Summary

• add a Python 3.11 uv lockfile and reproducible notebook/build tooling
• fix notebook execution blockers, use bundled datasets where available, and refresh the planned print-safe figure outputs
• replace the old homework assignments with 13 title-only notebooks and add a title-only authoring template
• add an instructor-facing 13-homework Codex progression covering AGENTS.md, test harnesses, skills, thin dashboards, and math-based verification
• preserve the classic Jupyter Book routes used by Brightspace while adding Homework 9–13
• include a tentative, unpublished Homework 1 planning draft based only on Lectures 1–4

Verification

• 99/99 lecture notebooks executed successfully from a clean disposable copy
• 13/13 homework notebooks validated as title-only with no code cells
• classic Jupyter Book 0.15.1 build completed
• URL audit: 0 missing legacy pages, 0 missing activity pages, 0 broken internal files/fragments, and 0 missing legacy lecture anchors
• all 55 refreshed visual outputs were rendered and reviewed; two readability findings were corrected and rerun
• uv lock --check, uv sync --locked --dry-run, syntax checks, notebook structure checks, and git diff --check passed

Notes

Graphviz's dot executable remains a system dependency; Python packages and command-line Python tools are managed by uv. The Jupyter Book 2 migration experiment remains separate because legacy section-anchor compatibility is not yet complete.