Switch firstmate to OpenCode 2 and refresh nix-darwin pins

Point fm at the isolated oc2 wrapper, upgrade Homebrew packages on rebuild, and declare ffmpeg, docker-desktop, puremac, utm, node, and tea. Update nixpkgs, home-manager, and nix-homebrew locks. Track Pi agent config, crew-dispatch, and the Gitea PR helper that home.nix already expected.

flake.lock

@@ -3,16 +3,16 @@
     "brew-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1784068757,
-        "narHash": "sha256-7KnV7rTlMpys+2J+TFVxUDDyKPLXFs4wIMtckMC72VM=",
+        "lastModified": 1788591592,
+        "narHash": "sha256-NbwVKwKLFl0oXub7oPjvmDaOygCtV2oboeKTu4xXFTk=",
         "owner": "Homebrew",
         "repo": "brew",
-        "rev": "6bd951d96e7ebc54787799dba77bfb26ec956c4c",
+        "rev": "08e85c4e42f5d8f1ea17c36cb59cf61c2ccb26c3",
         "type": "github"
       },
       "original": {
         "owner": "Homebrew",
-        "ref": "6.0.11",
+        "ref": "6.0.22",
         "repo": "brew",
         "type": "github"
       }
@@ -24,11 +24,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1784350909,
-        "narHash": "sha256-ZWyzLbS1yKUTeFJLmdVuWNnHttL333/ldJbEE+KzCrM=",
+        "lastModified": 1789267039,
+        "narHash": "sha256-LWiBv9yAYFi2LPbUhDGHPGKYskJQjj2fw12OlyO1uQo=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "4ce190229c73d44536caa7072f6308fb2d8feeb3",
+        "rev": "ec172013fa62135f58fb58dd17ae9651e8f39727",
         "type": "github"
       },
       "original": {
@@ -64,11 +64,11 @@
         "brew-src": "brew-src"
       },
       "locked": {
-        "lastModified": 1784159664,
-        "narHash": "sha256-I/B6YoRLImHEqNWh8bs+tPjEDeteACeFhcLyoSMo1GE=",
+        "lastModified": 1788981439,
+        "narHash": "sha256-fEaFq0XgpgWFPLfpq1UK4/8ylHd2T0+fo6O3hKz1LUM=",
         "owner": "zhaofengli",
         "repo": "nix-homebrew",
-        "rev": "842eeb863ecca0eeb463f7a814cdc51e1d925776",
+        "rev": "09a921d0181146cf6163ec2cc1db7b6fd539a885",
         "type": "github"
       },
       "original": {
@@ -79,11 +79,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1784255083,
-        "narHash": "sha256-0Jz8G3+3g6i/l4aISUri0EidLnREelCff0m6+pE6aZg=",
+        "lastModified": 1789485310,
+        "narHash": "sha256-VsDMTLSkAAJmbNha6sGNzlF33X7RESWLl3SnjDQu+4U=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "fc51889f81924f15fba77a3c0b79cfb3f78fe0d4",
+        "rev": "0c32f40fe3e2a9adfc427fd5abc061a31043ea44",
         "type": "github"
       },
       "original": {