…#209) Closes #127, #128, #129, #130, #131. Detector-physics oriented batch: glass-sealing, magnetic-shielding, UHV/cryo, X-ray-window, and high-Z shielding metals each get a fully-cited entry in metals.toml. Properties populated per material (subset; see _sources for per-property provenance): - kovar (#127, ASTM F15, Fe-29Ni-17Co): density 8.36, E=138 GPa, σu=517, k=17.3, Cp=439, α(30-450°C)=5.86e-6 (the glass-sealing match), ρe=4.9e-7, μr~5000, Bs=1.6 T. Curie 435°C noted in _sources. - mu_metal (#128, ASTM A753 Type 4, 80Ni-15Fe-5Mo): density 8.7, E=215 GPa, σu=540, k=19, Cp=460, α=12.7e-6, ρe=6.0e-7, μr_max=100000, Bs=0.74 T. Hydrogen-anneal condition documented in _sources. - copper.OFHC (#129, expanded existing minimal entry, UNS C10100): full RT mechanical/thermal/electrical including k=391 W/(m·K), ρe=1.71e-8. Cryogenic enhancement noted, T-curve left for future PR. - beryllium (#130, S-200F vacuum hot-pressed): density 1.848, E=287 GPa, ν=0.032, k=200, Cp=1825, α=11.0e-6, ρe=3.6e-8. PDG nuclear: X0=35.28 cm, λI=42.10 cm, I=63.7 eV, Z=4. CBD hazard called out in TOML comment. - tantalum (#131, CP / ASTM B708 annealed): density 16.65, E=186 GPa, k=57.5, Cp=140, α=6.3e-6, ρe=1.31e-7. PDG nuclear: X0=0.4094 cm, λI=11.47 cm, I=718 eV, Z=73. Ta-2.5W noted as alternative in _sources. Primary citations: - NIST Cryogenic Material Properties (PD-USGov) — OFHC Cu thermal. - PDG Atomic & Nuclear Properties (PD-USGov) — Be/Ta nuclear & density. - Wikipedia / CRC Handbook (CC-BY-SA-4.0) — element-handbook scalars. LICENSES-DATA.md regenerated with the 6 new attribution rows. - Carpenter Technology Kovar datasheet, Magnetic Shield Corp MuMETAL, Materion S-200F, Plansee Tantalum (proprietary-reference-only) — vendor-specific mechanical properties. - ASTM F15 (Kovar), A753 (Mu-metal), B170/B187 (OFHC Cu), B708 (Ta) — compositional bounds, paywalled, cited as proprietary-reference-only. _CATEGORY_BASES["metals"] extended with kovar, mu_metal, OFHC, beryllium, tantalum so the lazy-loader resolves them. Full test suite (627 passed, 25 skipped) plus license check pass.

Add beryllium (X-ray window metal) #130

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