Follows the owner's other projects (sift, tether): nixpkgs pinned to
nixos-26.05, x86_64-linux, the version from the commit. `packages.default`
builds all six binaries with rustPlatform (tests stay in `make gate`),
`packages.tools-image` is deploy/tools-image.nix, and `devShells.default`
has Rust 1.95.0, clippy, rustfmt, cargo-deny and make. No NixOS module
yet: that is M8 (P22).
Checked on straylight: `nix flake check` passes; `nix build` gives
brokerd, bxctl, gatewayd, inferproxy, loopd and toolkit, each printing
its usage; `nix build .#tools-image` and `nix develop` work.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Implemented crates/brokerd/src/config.rs: typed Paths, Sockets, Approvals and
Config with serde(deny_unknown_fields, default) on every struct, hand-written
ConfigError (Read/Parse) with Display and std::error::Error, and the parse/load/
broker_socket/admin_socket/audit_dir/state_dir methods. Added serde, serde_json
and toml to crates/brokerd/Cargo.toml, registered pub mod config; in lib.rs,
added brokerd to the serde and serde_json Used-by cells in docs/dependencies.md,
and copied the given test and six fixtures byte-identical. 7 config tests pass;
make gate prints gate: ok.
Implemented-By: OpenCode session (model recorded in docs/implementer-log.md)