kanchi 0.1.0

Kanchi (感知 — "sensing") — typed environment-discovery primitive: declare detection axes, get the FALLBACK const + detect()→Option + detect_or_fallback() trio generated. The shikumi `discovered()` tier made declarative.
Documentation 
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{
  description = "Kanchi (感知) — typed environment-discovery primitive: declare detection axes, get FALLBACK const + detect()→Option + detect_or_fallback() generated";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-25.11";
    substrate = {
      url = "github:pleme-io/substrate";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    crate2nix.url = "github:nix-community/crate2nix";
  };

  outputs =
    {
      self,
      nixpkgs,
      substrate,
      crate2nix,
      ...
    }:
    let
      system = "aarch64-darwin";
      pkgs = import nixpkgs { inherit system; };
      rustLibrary = import "${substrate}/lib/rust-library.nix" {
        inherit system nixpkgs;
        nixLib = substrate;
        inherit crate2nix;
      };
      lib = rustLibrary {
        name = "kanchi";
        src = ./.;
      };
    in
    {
      inherit (lib) packages devShells apps;

      overlays.default = final: prev: {
        kanchi = self.packages.${final.system}.default;
      };

      formatter.${system} = pkgs.nixfmt-tree;
    };
}