Wire oleks/mcp-chrome into flake-hub

Adds mcp-chrome as a flake input (mirroring the woodpecker-peek pattern)
and re-exposes two packages: mcp-chrome-wasm-simd (proven green, ~22 s)
and mcp-chrome-extension (KNOWN-BROKEN under nix-daemon; exposed for
local builds but kept out of the CI matrix to avoid red pipelines).

CI warms attic with mcp-chrome-wasm-simd on x86_64-linux and aarch64-linux
only; s390x cross and Darwin are out of scope.

Closes oleks/mcp-chrome#5.

flake.nix

@@ -40,6 +40,16 @@
       url = "git+https://git.oleks.space/oleks/woodpecker-peek?ref=main";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    # mcp-chrome — Chrome MCP server + extension (English-localized fork of
+    # hangwin/mcp-chrome). Re-exposes the from-source wasm-simd worker (proven
+    # green, ~22 s) and the full chrome-mcp-extension build. The extension
+    # target is KNOWN-BROKEN under nix-daemon at this pin (see oleks/mcp-chrome
+    # issue #1 close comment); expect attic to miss it until that's resolved.
+    mcp-chrome = {
+      url = "git+https://git.oleks.space/oleks/mcp-chrome?ref=main";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   outputs =
@@ -53,6 +63,7 @@
       nix-deps,
       stalewood,
       woodpecker-peek,
+      mcp-chrome,
       ...
     }:
     let
@@ -127,6 +138,14 @@
           # attic-cached binary via flake-hub's overlay, then set
           # services.woodpecker-peek.package = pkgs.woodpecker-peek;.
           woodpecker-peek = woodpecker-peek.packages.${sys}.default;
+          # mcp-chrome — Rust→wasm worker (proven green) plus the full
+          # chrome-mcp-extension build. The latter is KNOWN-BROKEN under
+          # nix-daemon at this pin; flake-hub CI will miss the cache on it
+          # until upstream resolves that. wasm-simd alone is what consumers
+          # actually pull cached today (commits 9534234, b276465 in
+          # oleks/mcp-chrome sync the built wasm back into the tree).
+          mcp-chrome-wasm-simd = mcp-chrome.packages.${sys}.wasm-simd;
+          mcp-chrome-extension = mcp-chrome.packages.${sys}.chrome-mcp-extension;
         };
 
       # Overlay providing Hyprspace. Requires `pkgs.hyprland` to be present