build(pixi): add eigen-abi-devel and nlohmann_json

[olantwin]

Summary

• pixi run configure currently fails because CMake cannot satisfy find_dependency(Eigen3 5.0.1 CONFIG) called from GeoModelCoreConfig.cmake. Conda-forge eigen ships Eigen3Config.cmake under share/eigen3/cmake/, a path CMake does not search by default; depending on eigen-abi-devel puts the Config in a discoverable location (eigen-feedstock README case B).
• Adds nlohmann_json alongside, since GeoModelToolsConfig.cmake calls find_dependency(nlohmann_json 3.12.0) and it is only pulled transitively today.
• Mirrors the equivalent host-dep additions in the shipgeometry conda recipe (commits 0fbdc8b, 3632633, 56bbca2).

pixi.lock also drops the now-empty virtual-packages: block — an incidental normalization from re-running pixi install, unrelated to the dep change.

Test plan

• pixi install resolves
• pixi run configure succeeds (previously failed on Eigen3)
• pixi run build builds all 169 targets
• pixi run test — 33/33 pass

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7ea86434-ca1e-479f-8337-fd34fc53d6d3

📥 Commits

Reviewing files that changed from the base of the PR and between 00f0252 and 2076253.

⛔ Files ignored due to path filters (1)

• pixi.lock is excluded by !**/*.lock

📒 Files selected for processing (1)

• pixi.toml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch pixi-add-eigen

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