phxstack-learn
Append one three-line lesson to LEARNED.md. Use after shipping, when something surprised you, or when a non-obvious fix would save future time.
SKILL.mdskills/phxstack-learn/SKILL.md
GitHubphxstack-learn
One lesson. Three lines. No essay.
Search LEARNED.md for an equivalent entry. If none exists, append exactly:
## YYYY-MM-DD — Short title
One useful fact.
One consequence or action.