feat(sheet-metal): foundation tier — vcad-kernel-sheet + design spec#177
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feat(sheet-metal): foundation tier — vcad-kernel-sheet + design spec#177
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Lays the legendary architecture from docs/design/sheet-metal.md: a SheetMetalModel as a graph of flat panels connected by cylindrical bends, where the graph is the source of truth and both bent 3D and flat-pattern views are derived. This makes unfold/refold inverses by construction — the tests prove `refold ∘ unfold = identity` on bent frames within 1e-9, with no drift across 10 round-trips. Foundation tier: - Panel + Bend + SheetMetalModel with BFS traversal - BendTable with K-factor lookup and KFactorSource provenance (Builtin/Shop/Measured/Manual) — drives the colored dot in the UI - base_flange_rect / base_flange_polygon - add_edge_flange with manual_k override - unfold / refold operating in place on the model - FlatPattern projection for DXF / nesting / flat editor - 33 tests covering geometry, allowance math, involution, drift Layered behind this: the strategic spec in docs/design/sheet-metal.md covering bends-as-typed-topology, lossless bidirectional unfold, open community bend-table registry, manufacturability-as-MCP, springback physics, costing, and the dual-view + flat-as-peer UI plan. https://claude.ai/code/session_019XYMEQuLaAX45cqDtpyen7
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Lays the legendary architecture from docs/design/sheet-metal.md: a
SheetMetalModel as a graph of flat panels connected by cylindrical
bends, where the graph is the source of truth and both bent 3D and
flat-pattern views are derived. This makes unfold/refold inverses by
construction — the tests prove
refold ∘ unfold = identityon bentframes within 1e-9, with no drift across 10 round-trips.
Foundation tier:
(Builtin/Shop/Measured/Manual) — drives the colored dot in the UI
Layered behind this: the strategic spec in docs/design/sheet-metal.md
covering bends-as-typed-topology, lossless bidirectional unfold,
open community bend-table registry, manufacturability-as-MCP,
springback physics, costing, and the dual-view + flat-as-peer UI plan.
https://claude.ai/code/session_019XYMEQuLaAX45cqDtpyen7