feat(m2): V61 measured trench seed for K1 halls 1-5 from CAD
Owner directive 2026-07-15: seed real trench coordinates.
- tools/cad/extract_trench_seed.py: deterministic generator - extracts trench
channels from CAD layer 5-tranchi (spelling differs from expected), merges
paired channel edges into centerlines, emits supply points every 6m
- Measured layout (identical across halls 1-5, cross-validating band alignment):
7 horizontal channels per hall, 9.0m pitch, y=5.85..59.8m local,
extent x[20.6..170.2]m
- V61: delete assumed grid points for H1-H5, insert 875 measured points
(is_assumed=false); supply flags keep V5 policy; K2 stays assumed (no trench
layer in its plan drawing - power trunk drawing analysis is follow-up)
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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