Add beads Claude plugin installation via home-manager

- Add beadsRepo reference from flake input
- Add activation script to install beads as marketplace plugin
- Updates known_marketplaces.json and config.json declaratively

flake.lock

@@ -1,5 +1,26 @@
 {
   "nodes": {
+    "beads": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": [
+          "nixpkgs-unstable"
+        ]
+      },
+      "locked": {
+        "lastModified": 1767911810,
+        "narHash": "sha256-0L4ATr01UsmBC0rSW62VIMVVSUihAQu2+ZOoHk9BQnA=",
+        "owner": "steveyegge",
+        "repo": "beads",
+        "rev": "28ff9fe9919a9665a0f00f5b3fcd084b43fb6cc3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "steveyegge",
+        "repo": "beads",
+        "type": "github"
+      }
+    },
     "flake-compat": {
       "flake": false,
       "locked": {
@@ -16,6 +37,24 @@
         "type": "github"
       }
     },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "google-cookie-retrieval": {
       "inputs": {
         "nixpkgs": [
@@ -258,6 +297,7 @@
     },
     "root": {
       "inputs": {
+        "beads": "beads",
         "google-cookie-retrieval": "google-cookie-retrieval",
         "home-manager": "home-manager",
         "home-manager-unstable": "home-manager-unstable",
@@ -269,6 +309,21 @@
         "plasma-manager": "plasma-manager",
         "plasma-manager-unstable": "plasma-manager-unstable"
       }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",