ypshimandClaude Haiku 5.5 46709be532 feat(core): polyline coping axis with per-stretch frames (bent coping stage 1)
- buildAxis: IP1 → IP4 → IP3 as stretches with their own frames; arc length s
  from IP1; mitre normal u1 + u2 at the kink.
- toAxis / fromAxis: world ↔ (k, s, n) round trip; stretch chosen by the mitre plane.
- copingSpan (centred on L_IP/2) and nearKink (columns within the Level half-width).
- Straight P1 regression against spec §12 bearing values; bent round trip and continuity.
- Not wired into buildPier yet; the model still refuses bent coping (미실시).

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
2026-10-22 09:18:31 +09:00
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