route.py: Manhattan distance, the rectilinear minimum spanning tree (Prim
over |dx| + |dy|, exact on the points given) and the x-then-y route.
pipe_rows turns the P&ID's runs into rows by room x service x diameter.
length_source auto measures on the P&ID only when the scale check calls it
to scale; otherwise each run is the RMST of its tags' layout positions plus
vertical_allowance per connection, with the drawn length kept beside it as
schematic_m. length_source=pid on a schematic P&ID is refused with the
statistics unless force=True. Status A / B / C; a C run goes to control
with its schematic length, counted and flagged. Routed lengths are shared
among the layout rooms their route crosses (track F's face finder); the
allowance is its own column. Lengths are metres from the unit the geometry
implies: a layout declaring inches over millimetres is read in mm and warned
about, never multiplied by 25.4.
The takeoff carries narrow stand-ins for the unit inference, the plan-copy
clusters and the scale check (group U's modules are on another branch); a
scale result passed in is used first. Tags written twice in the chosen
cluster are ambiguous, never picked.
Beyond the plan: the scale stand-in calls a non-positive median ratio
insufficient (as group U's scale_check does) instead of to_scale with a
factor of 0; an INSUNITS code the reader does not convert is named in the
unit warning instead of being called "no unit"; wall layers are classified
once per layer, not once per record.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FKFStjEFzpGyLq5bMpWxTd
