Adds a second machine class (small fan-shaped reach arm) alongside the
CR-10/AxiDraw rectangular-bed plotters, so wet signatures can be produced
while away from the home station.
ink_signature_plotter.py:
- PlotterConfig gains dialect (marlin|lineus) + name; new LineUsConfig
(native units, pen height = per-move Z, reach annulus from shoulder pivot).
- Named machine profiles (cr10 default, axidraw, lineus) via load_profile().
- bed_mm_to_lineus_units(), check_reach() (annulus for lineus, rectangle for
marlin), compute_jig_offset_for_box() (solves jig from the ACTUAL fitted ink
extent so a wide cell line doesn't over-constrain a small arm).
- emit_gcode() dispatches to emit_marlin_gcode()/emit_lineus_gcode().
- send_lineus(): WiFi TCP 1337 (NUL-terminated, ok-acked) or USB serial,
dry_run=True default (same gating as the CR-10 path).
ink_signature_cli.py: --profile, --solve-jig (auto-applies jig offset),
--lineus-host/--lineus-usb, reach-check that refuses to --plot out-of-reach
on Line-us.
Tests: 43 checks (was 30) covering profiles, reach check, jig solve, lineus
emitter, dry-run sender. Docs updated with profiles + portable workflow.
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