…#214) * feat(data): add borated PE, ordinary concrete, SF6 (#144, #145, #146) Phase 5 batch 9 — three shielding/insulation materials closing the final issues in the Materials Catalog Expansion milestone. - borated_pe: 5 wt% natural-B HDPE neutron-shielding composite. Mechanical / thermal scalars from Emco Plastics borated-HDPE 5 wt% datasheet, cross-checked against Shieldwerx SWX-201 family. Nuclear table omitted — PDG does not list borated PE separately and the (n,α) capture cross- section has no schema slot (TODO: schema neutron_capture_xs). - concrete_ordinary: NIST PML PSTAR / Geant4 G4_CONCRETE canonical Portland-concrete composition (matno=144). Density 2.30 g/cm^3, I = 135.2 eV; X0 and λ from PDG 2024 `shielding concrete` table. Mechanical / thermal scalars omitted — too mix-design-dependent for a single primary citation. - sf6: high-voltage dielectric gas. Density and triple-point T from Guder & Wagner (2009) JPCRD reference EOS. Thermal conductivity from Assael et al. (2012) JPCRD NIST-coauthored reference correlation. Cp from NIST-JANAF (Chase 1998). Breakdown voltage 8.9 kV/mm at 1 atm underwritten by Christophorou-Olthoff-Van Brunt (1997) NIST review and the (E/N)_lim ≈ 361 Td result of Christophorou & Olthoff (2000) JPCRD. Dielectric constant ε_r = 1.002 from Kita & Schloesser (1994). Closes #144, #145, #146. * chore(typos): allowlist ACI (American Concrete Institute) (#145) `typos` was rewriting "ACI" → "ACPI" inside ceramics.toml comments referencing ACI 318 (the concrete-engineering standard). Adding ACI to the allowlist; same pattern as LSO and DuPont above.

Add borated polyethylene (5% B) #144

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