git:20260907.012a971 to git:20261013.30600c3

7 added, 0 removed. Audit A to A.

# AgentFEM Case Instructions
+ - Export through `step.solve_result(output=...)`; for custom loops use
+ `io.ResultWriter`. Do not hand-write connectivity, node permutations or XDMF
+ blocks. Use the result manifest's recommended visualization artifact.
+ - Keep point/cell/quadrature fields distinct. Use explicit cell identities for
+ external arrays, not equal-length assumptions or default interface smoothing.
+ - Apply Warp once to reference geometry, never again to already deformed output.
+
- Keep temperature constraints, heat sources, heat fluxes, and convection as
distinct engineering concepts.
- Run `agentfem doctor`, `agentfem check`, and `agentfem run` in that order.
- Inspect the result manifest referenced by
`outputs/latest.json` before interpreting the field.
- Preserve units and sign conventions in every change.