Module ownership
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Code ownership analysis per spec §1.1 — Fractal Value (1 − HHI).
FV ∈ [0, 1); 0 = single owner, → 1 = perfectly fragmented. Inspired by D’Ambros, Gall, Lanza & Pinzger.
Also surfaces the main developer (author with highest revision count) per file.
Research basis: see docs/research-foundations.md entry “ownership”
(Mockus & Herbsleb, ICSE 2002 — expertise concentration measurement;
Hirschman 1980 — Herfindahl–Hirschman concentration index borrowed
from industrial organisation).