Move the dev toolchain to fenix on nixos-26.05 - #45
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Part of pinning every repo the kitaebot fleet builds to one nixpkgs rev and one toolchain provider so devshell closures share store paths in the bot VM. rust-overlay goes away in favor of fenix, matching the other repos. The toolchain itself does not move: 1.85.1 still matches Cargo.toml's rust-version, and rustfmt still comes from a nightly so rustfmt.toml's nightly-only options keep working. The old input pinned the 25.11 release tag, which never picks up channel backports; nixos-26.05 is the maintained release branch.
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Part of aligning the kitaebot fleet onto one nixpkgs rev (
fcb8fcd6, nixos-26.05) and one toolchain provider (fenix). The toolchain itself does not move: 1.85.1 still matches Cargo.toml'srust-version, and rustfmt still comes from a nightly so rustfmt.toml's nightly-only options keep working; the nixpkgs-bitcoind pin is untouched. Devshell builds clean:rustc 1.85.1,rustfmt 1.10.0-nightly,just 1.51.0.