Migrate the development shell to a locked Nix flake

[danielporterda]

This pull request replaces the channel-sensitive nix-shell entrypoint with a locked flake used consistently by direnv, CI, and generated-reference automation. It preserves the existing toolchain and environment behavior while removing the implicit <nixpkgs> search-path lookup.

[hrischuk-da]

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-- Curtis Hrischuk 919-414-2253 Principal Product Manager ***@***.*** <https://www.linkedin.com/company/digitalassetcom> <https://x.com/digitalasset> ***@***.***> Creators of Canton

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