last 90 days. each contribution gets a selflessness 0→1 based on who it was for:
sponsor someone → 1
PR/issue to a repo your code depends on → 1
anyone else's repo → external base, higher if it's popular
your own / your org's repo → 0 if nobody uses it, scaling up with stars+forks to owned cap

alignment = weighted mean (PR, issue, commit, sponsor weights) · 0.5 is the centre tick