9b04a48a86
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Adds the Kindred constraint solver as a pluggable Assembly workbench backend, covering phases 3d through 5 of the solver roadmap. Phase 3d: SolveContext packing - Pack/unpack SolveContext into .kc archive on document save Solver addon (mods/solver): - Phase 1: Expression DAG, Newton-Raphson + BFGS, 3 basic constraints - Phase 2: Full constraint vocabulary — all 24 BaseJointKind types - Phase 3: Graph decomposition for cluster-by-cluster solving - Phase 4: Per-entity DOF diagnostics, overconstrained detection, half-space preference tracking, minimum-movement weighting - Phase 5: _build_system extraction, diagnose(), drag protocol, joint limits warning Assembly workbench integration: - Preference-driven solver selection (reads Mod/Assembly/Solver param) - Solver backend combo box in Assembly preferences UI - resetSolver() on AssemblyObject for live preference switching - Integration tests (TestKindredSolverIntegration.py) - In-client console test script (console_test_phase5.py)