The transition parser dropped airways, so mandate splices filed all-DCT
(MOVUM DCT HAREM) — wrong routing, and the arrival splice self-looped
(ROUTE49) when the enroute already crossed the arrival area.
- rad: expand_via keeps airway tokens (is_airway_tok); a transition is now
a point/airway token sequence (DCT where no airway), e.g.
[MOVUM, T109, HAREM, T104, WLD].
- discover: transition_legs() builds legs with the interspersed airways.
route_via_arrival_transition anchors on the transition ENTRY (first
on-airway point) and flies the transition through once — the enroute leg
stops before the arrival area, so no self-loop. route_via_transition and
the est/near sorts use the last/first *point* (skip airways).
Files the mandate correctly now (… MOVUM T109 HAREM T104 WLD DCT EDDM).
Coverage 6/10 held, no regression (LFPG-EDDF still passes); LSZH-EGLL
6→4 PROF204; EGLL-EDDM's fake 1-err self-loop is replaced by its real
residuals (CPT dep forbidden, forbidden points on the mandated T104, WLD
STAR limit). 49 tests green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Alexandre
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