新增cdsl

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2026-08-24 14:52:08 +08:00
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# CDSL Bridge: Flange
- Use for a circular flange, flanged sleeve, or coupling flange with a shared central axis.
- Invariants: coaxial outside diameter, bore/hub, sealing land, and fastener holes on a pitch circle.
- Plan: `revolve_add` for stepped axisymmetric bodies or circular `extrude_add_blind` -> coaxial bore -> one bolt-hole definition -> explicit circle set or supported repetition -> late finishing.
- No circular-pattern atomic exists. Expand a bolt circle into explicit circles in one cut profile and record `expanded` in the audit.
- Keep bolt-circle diameter, count, start angle, bore, and hub dimensions distinct.