Section the cut list for trapped antennas; label vertical radiator vs radials

[skip17331]

Context

Following the fan-dipole build-sheet fix (#10), I checked the other multiband antennas. Two more problems, both from the cut list grouping the deck's wires purely by length:

1. Trapped dipole / trapped vertical (the wizard outputs) showed the radiator as one continuous wire — the traps are NEC loads, not cuts — so a builder got the trap winding specs but no idea where to cut the wire or place each trap.
2. A vertical's cut list conflated the radiator with same-length radials into one nonsensical line (e.g. "Antenna wire, qty 33"), and never said which was which.

Fix — model-driven cut list for these antennas

• Sectioned radiator (trapped/loaded centre-fed dipole & inverted-V, and any vertical/inverted-L): the radiator is split into the wire sections between the feedpoint, each trap/coil, and the tip — Feedpoint → T1, T1 → T2, T2 → tip — with labels matching the winding/reactance sections. A centre-fed dipole is a symmetric pair (quantity 2); a base-fed vertical is a single arm.
• Labelled radials: a vertical/inverted-L lists its radials as their own entries (Ground radials / Elevated radials, quantity = count, at true length), never merged with the radiator.

build_sheet now composes the cut list via _compose_cut_list (fan dipole / vertical / loaded-dipole / generic), and the model-driven antennas take their wire total from that cut list. Every other antenna is unchanged (verified — existing build-sheet/coil/vertical/sketch tests pass untouched).

Before → after

Trapped dipole 40/20/15
  Antenna wire   qty 1   20.5 m        Feedpoint → T1   x2   3.46 m
                                  →     T1 → T2          x2   1.72 m
                                        T2 → tip         x2   5.08 m

Trapped vertical 40/20/15
  Antenna wire   qty 33  10.26 m       Feedpoint → T1   x1   3.46 m
   (radiator + 32 radials!)      →     T1 → T2          x1   1.72 m
                                        T2 → tip         x1   5.08 m
                                        Ground radials   x32  10.26 m

Tests

tests/test_buildsheet.py (+3): trapped-dipole sectioning (qty 2 per leg, no "Antenna wire"), trapped-vertical sections + separate radials (no qty-33 conflation), plain-vertical radiator/radial labels. Suite 516 → 519, green locally.

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