feat(claude): add caveman and oh-my-claudecode skills via flake inputs

Declaratively manage Claude Code skills through home-manager by fetching
plugin repos as non-flake inputs and symlinking their skills directories.

flake.lock

@@ -1,5 +1,21 @@
 {
   "nodes": {
+    "caveman": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1776507098,
+        "narHash": "sha256-M+NoWXxrhtbkbe/lmq7P0/KpmqOZzJjhgeUVjY+7N2k=",
+        "owner": "JuliusBrussee",
+        "repo": "caveman",
+        "rev": "84cc3c14fa1e10182adaced856e003406ccd250d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "JuliusBrussee",
+        "repo": "caveman",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -76,11 +92,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1775126147,
-        "narHash": "sha256-J0dZU4atgcfo4QvM9D92uQ0Oe1eLTxBVXjJzdEMQpD0=",
+        "lastModified": 1776329215,
+        "narHash": "sha256-a8BYi3mzoJ/AcJP8UldOx8emoPRLeWqALZWu4ZvjPXw=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "8d8c1fa5b412c223ffa47410867813290cdedfef",
+        "rev": "b86751bc4085f48661017fa226dee99fab6c651b",
         "type": "github"
       },
       "original": {
@@ -106,12 +122,30 @@
         "type": "github"
       }
     },
+    "oh-my-claudecode": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1776693787,
+        "narHash": "sha256-C/m8Vlt6MXy8nlgqtoey9A5JnVTHCPkGUjar9x5Y2uw=",
+        "owner": "Yeachan-Heo",
+        "repo": "oh-my-claudecode",
+        "rev": "084fc47266824b35f4c8cbe886c0990ae716c184",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Yeachan-Heo",
+        "repo": "oh-my-claudecode",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
+        "caveman": "caveman",
         "home-manager": "home-manager",
         "kickstart-nvim": "kickstart-nvim",
         "nixpkgs": "nixpkgs_2",
-        "nixpkgs-unstable": "nixpkgs-unstable"
+        "nixpkgs-unstable": "nixpkgs-unstable",
+        "oh-my-claudecode": "oh-my-claudecode"
       }
     },
     "systems": {