New library/packet/fork-leaders.js: a pure, deterministic router for one
paired-row leader, forking a stem at a 45° chamfer into two short legs
(one per pin), in row and trunk modes. All segments H/V/45°. Returns
polylines for drawing and a deduped segment list (stem once) so a fork
counts as one polyline for crossings, plus octilinear and through-pin
reports. Imitates the poster-render octilinear lane routing (read, not
called). Adds check:fork-leaders (both modes, 0 crossings on a 220-row
monotone set, through-pin + poison arms).
New library/packet/pins-in-state.js: a deterministic pixel-space pin
de-overlap for the whole-India poster that also keeps every pin inside
its own ADM1 state (multipolygon + holes), pulling a pushed-out pin to
the nearest point just inside. Reports displacement, remaining overlaps,
pins-outside (0), and an infeasible list for states too small to hold
their pins — never a silent overlap. Imitates the poster-render pin
relaxation (read, not called). Adds check:pins-in-state (real India data
when present, else a 60x96 fixture; hole/island + poison arms).
