Implements draw_aircraft() with heading arrow (filled/outlined for MLAT),
callsign+altitude label, and a 5-dot fade trail. Adds 5 tests covering
all ACs; all 94 tests pass, ruff lint and format clean.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Creates the complete src/planemapper/ layout with all module stubs,
provisioning and renderer subpackages, airports.csv data bundle,
systemd unit files, and full test scaffold. All three quality gates
pass: pytest 12/12, ruff check zero violations, ruff format clean.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Matt Edholm