Agent guidance (fa525ab6): AGENTS.md gains the code-change workflow (branch, local test, merge to main as EXPERIMENTAL, executor verification by a BUILD, docs, delete the branch), push rules (feature branches may be pushed without asking; main needs the owner's go or a grant recorded in the thread), reading CI results before reporting a push done, the performance-change rules (judge on coupled cases; keep proven-identical changes; compare particles by id), runnable and module naming, and how pages are written (current behaviour only; planned work only on page 57 and its index; physics pages not authored unsupervised; search git log before calling a design reason unknown).