feat(nix): bootstrap clan-core for sunken-ship + phantom-ship 🏴‍☠️

Stage 4a of the dendritic + clan migration. Both servers now live under
clan.machines (via nixos/flake-modules/clan.nix) and clan-core generates
their nixosConfigurations for us; the previous per-host flake-modules
are removed.

Notes:
- clan.core.enableRecommendedDefaults = false on both machines so we
  keep the existing dhcpcd / non-networkd / non-resolved stack. Services
  like dnsmasq, navidrome, and the existing wireless setup break with
  the clan defaults on.
- dotfiles-rebuild timer is untouched (safety net). Replacing it with
  clan machines update / dm-pull-deploy comes in 4e.
- mac stays outside the clan as admin only.

Verified: `clan machines list --flake path:…/nixos` returns both hosts;
both servers rebuild cleanly and all services (navidrome, cloudflare-
tunnel, fitness-bot, dnsmasq, openclaw-gateway, sshd) stay active.

nixos/flake-modules/clan.nix

@@ -0,0 +1,55 @@
+# clan.lol wiring for the homelab.
+#
+# Declares `sunken-ship` and `phantom-ship` as clan machines. Each machine's
+# `imports` list is the NixOS module set that used to live in its own
+# flake-module. clan-core produces `flake.nixosConfigurations.<name>` from
+# these, which is why the old per-host flake-modules were removed.
+#
+# The mac stays outside the clan — admin only, uses `clan machines update`
+# to push to the servers.
+{ config, inputs, ... }:
+let
+  lib = inputs.nixpkgs.lib;
+  hmModule = { user, homeDirectory, stateVersion ? null, userImports ? [ ] }:
+    import ../lib/home-manager-user.nix {
+      inherit lib user homeDirectory stateVersion userImports;
+    };
+in {
+  imports = [ inputs.clan-core.flakeModules.default ];
+
+  clan = {
+    meta.name = "homelab";
+
+    # Preserve current network / init stack (no systemd-networkd/resolved,
+    # no boot.initrd.systemd, no extra debug packages). Revisit per-service
+    # in later stages rather than flipping this fleet-wide.
+    machines.sunken-ship = {
+      imports = [
+        { clan.core.enableRecommendedDefaults = false; }
+        ../hosts/sunken-ship.nix
+        config.flake.nixosModules.dotfiles-rebuild
+        inputs.home-manager.nixosModules.home-manager
+        (hmModule {
+          user = "danny";
+          homeDirectory = "/home/danny";
+          stateVersion = "25.11";
+        })
+      ];
+    };
+
+    machines.phantom-ship = {
+      imports = [
+        { clan.core.enableRecommendedDefaults = false; }
+        inputs.nix-openclaw.nixosModules.openclaw-gateway
+        ../hosts/phantom-ship.nix
+        config.flake.nixosModules.dotfiles-rebuild
+        inputs.home-manager.nixosModules.home-manager
+        (hmModule {
+          user = "danny";
+          homeDirectory = "/home/danny";
+          stateVersion = "25.11";
+        })
+      ];
+    };
+  };
+}

nixos/flake-modules/phantom-ship.nix

@@ -1,18 +0,0 @@
-{ inputs, config, ... }: {
-  flake.nixosConfigurations.phantom-ship = inputs.nixpkgs.lib.nixosSystem {
-    system = "x86_64-linux";
-    modules = [
-      inputs.nix-openclaw.nixosModules.openclaw-gateway
-      ../hosts/phantom-ship.nix
-      config.flake.nixosModules.dotfiles-rebuild
-
-      inputs.home-manager.nixosModules.home-manager
-      (import ../lib/home-manager-user.nix {
-        lib = inputs.nixpkgs.lib;
-        user = "danny";
-        homeDirectory = "/home/danny";
-        stateVersion = "25.11";
-      })
-    ];
-  };
-}

nixos/flake-modules/sunken-ship.nix

@@ -1,17 +0,0 @@
-{ inputs, config, ... }: {
-  flake.nixosConfigurations.sunken-ship = inputs.nixpkgs.lib.nixosSystem {
-    system = "x86_64-linux";
-    modules = [
-      ../hosts/sunken-ship.nix
-      config.flake.nixosModules.dotfiles-rebuild
-
-      inputs.home-manager.nixosModules.home-manager
-      (import ../lib/home-manager-user.nix {
-        lib = inputs.nixpkgs.lib;
-        user = "danny";
-        homeDirectory = "/home/danny";
-        stateVersion = "25.11";
-      })
-    ];
-  };
-}

nixos/flake.lock

@@ -1,6 +1,82 @@
 {
   "nodes": {
+    "clan-core": {
+      "inputs": {
+        "data-mesher": "data-mesher",
+        "disko": "disko",
+        "flake-parts": [
+          "flake-parts"
+        ],
+        "nix-darwin": "nix-darwin",
+        "nix-select": "nix-select",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "sops-nix": "sops-nix",
+        "systems": "systems",
+        "treefmt-nix": "treefmt-nix"
+      },
+      "locked": {
+        "lastModified": 1776557977,
+        "narHash": "sha256-j+UWg3fR6jWKPqkPoqRf1a6nR1b/AnZXDuh04H+voUc=",
+        "rev": "e9ced950bedc726492e5cb52139bf5f17258dc69",
+        "type": "tarball",
+        "url": "https://git.clan.lol/api/v1/repos/clan/clan-core/archive/e9ced950bedc726492e5cb52139bf5f17258dc69.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://git.clan.lol/clan/clan-core/archive/main.tar.gz"
+      }
+    },
+    "data-mesher": {
+      "inputs": {
+        "flake-parts": [
+          "clan-core",
+          "flake-parts"
+        ],
+        "nixpkgs": [
+          "clan-core",
+          "nixpkgs"
+        ],
+        "treefmt-nix": [
+          "clan-core",
+          "treefmt-nix"
+        ]
+      },
+      "locked": {
+        "lastModified": 1776506822,
+        "narHash": "sha256-WlxAhXEoDHbkfFw3uNYra0CXce7pBk314x9chPu7ycE=",
+        "rev": "c3f48f5931b27bb9cc58de8799d36ecefb867d98",
+        "type": "tarball",
+        "url": "https://git.clan.lol/api/v1/repos/clan/data-mesher/archive/c3f48f5931b27bb9cc58de8799d36ecefb867d98.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://git.clan.lol/clan/data-mesher/archive/main.tar.gz"
+      }
+    },
     "disko": {
+      "inputs": {
+        "nixpkgs": [
+          "clan-core",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1773889306,
+        "narHash": "sha256-PAqwnsBSI9SVC2QugvQ3xeYCB0otOwCacB1ueQj2tgw=",
+        "owner": "nix-community",
+        "repo": "disko",
+        "rev": "5ad85c82cc52264f4beddc934ba57f3789f28347",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "disko",
+        "type": "github"
+      }
+    },
+    "disko_2": {
       "inputs": {
         "nixpkgs": [
           "nixpkgs"
@@ -58,7 +134,7 @@
     },
     "flake-utils": {
       "inputs": {
-        "systems": "systems"
+        "systems": "systems_2"
       },
       "locked": {
         "lastModified": 1731533236,
@@ -76,7 +152,7 @@
     },
     "flake-utils_2": {
       "inputs": {
-        "systems": "systems_2"
+        "systems": "systems_3"
       },
       "locked": {
         "lastModified": 1681202837,
@@ -170,6 +246,27 @@
       }
     },
     "nix-darwin": {
+      "inputs": {
+        "nixpkgs": [
+          "clan-core",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1775037210,
+        "narHash": "sha256-KM2WYj6EA7M/FVZVCl3rqWY+TFV5QzSyyGE2gQxeODU=",
+        "owner": "nix-darwin",
+        "repo": "nix-darwin",
+        "rev": "06648f4902343228ce2de79f291dd5a58ee12146",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-darwin",
+        "repo": "nix-darwin",
+        "type": "github"
+      }
+    },
+    "nix-darwin_2": {
       "inputs": {
         "nixpkgs": [
           "nixpkgs"
@@ -213,6 +310,19 @@
         "type": "github"
       }
     },
+    "nix-select": {
+      "locked": {
+        "lastModified": 1763303120,
+        "narHash": "sha256-yxcNOha7Cfv2nhVpz9ZXSNKk0R7wt4AiBklJ8D24rVg=",
+        "rev": "3d1e3860bef36857a01a2ddecba7cdb0a14c35a9",
+        "type": "tarball",
+        "url": "https://git.clan.lol/api/v1/repos/clan/nix-select/archive/3d1e3860bef36857a01a2ddecba7cdb0a14c35a9.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://git.clan.lol/clan/nix-select/archive/main.tar.gz"
+      }
+    },
     "nix-steipete-tools": {
       "inputs": {
         "nixpkgs": "nixpkgs"
@@ -315,11 +425,12 @@
     },
     "root": {
       "inputs": {
-        "disko": "disko",
+        "clan-core": "clan-core",
+        "disko": "disko_2",
         "flake-parts": "flake-parts",
         "home-manager": "home-manager",
         "import-tree": "import-tree",
-        "nix-darwin": "nix-darwin",
+        "nix-darwin": "nix-darwin_2",
         "nix-openclaw": "nix-openclaw",
         "nixos-wsl": "nixos-wsl",
         "nixpkgs": "nixpkgs_3",
@@ -327,17 +438,39 @@
         "zen-browser": "zen-browser"
       }
     },
+    "sops-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "clan-core",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1776119890,
+        "narHash": "sha256-Zm6bxLNnEOYuS/SzrAGsYuXSwk3cbkRQZY0fJnk8a5M=",
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "rev": "d4971dd58c6627bfee52a1ad4237637c0a2fb0cd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "type": "github"
+      }
+    },
     "systems": {
       "locked": {
-        "lastModified": 1681028828,
+        "lastModified": 1774449309,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "narHash": "sha256-brhZ8DmuGtzkCYHJg4HEd602amKm89Y9ytsFZ5uWD1w=",
         "owner": "nix-systems",
         "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "rev": "c29398b59d2048c4ab79345812849c9bd15e9150",
         "type": "github"
       },
       "original": {
         "owner": "nix-systems",
+        "ref": "future-26.11",
         "repo": "default",
         "type": "github"
       }
@@ -357,6 +490,42 @@
         "type": "github"
       }
     },
+    "systems_3": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "clan-core",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1775636079,
+        "narHash": "sha256-pc20NRoMdiar8oPQceQT47UUZMBTiMdUuWrYu2obUP0=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "790751ff7fd3801feeaf96d7dc416a8d581265ba",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    },
     "vscode-server": {
       "inputs": {
         "flake-utils": "flake-utils_2",

nixos/flake.nix

@@ -24,6 +24,10 @@
 
     nix-openclaw.url = "github:openclaw/nix-openclaw";
     nix-openclaw.inputs.nixpkgs.follows = "nixpkgs";
+
+    clan-core.url = "https://git.clan.lol/clan/clan-core/archive/main.tar.gz";
+    clan-core.inputs.nixpkgs.follows = "nixpkgs";
+    clan-core.inputs.flake-parts.follows = "flake-parts";
   };
 
   outputs = inputs @ { flake-parts, import-tree, ... }: