Add skillsmcp MCP server package

Update documentation in README.md and AGENTS.md
Refresh flake.lock for nixpkgs and flake-parts
Disable fastmcp checks to avoid version conflicts

flake.lock

@@ -60,11 +60,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1775087534,
-        "narHash": "sha256-91qqW8lhL7TLwgQWijoGBbiD4t7/q75KTi8NxjVmSmA=",
+        "lastModified": 1777988971,
+        "narHash": "sha256-qIoWPDs+0/8JecyYgE3gpKQxW/4bLW/gp45vow9ioCQ=",
         "owner": "hercules-ci",
         "repo": "flake-parts",
-        "rev": "3107b77cd68437b9a76194f0f7f9c55f2329ca5b",
+        "rev": "0678d8986be1661af6bb555f3489f2fdfc31f6ff",
         "type": "github"
       },
       "original": {
@@ -75,11 +75,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1777270315,
-        "narHash": "sha256-yKB4G6cKsQsWN7M6rZGk6gkJPDNPIzT05y4qzRyCDlI=",
+        "lastModified": 1777946660,
+        "narHash": "sha256-iw3XDIG6xxk+AZTcawCLHf6i9i4tXRzLZEoV9xhRToQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "6368eda62c9775c38ef7f714b2555a741c20c72d",
+        "rev": "bc57abace07689cfd34203aa5fb4027514895987",
         "type": "github"
       },
       "original": {