incorporated john-p14s, big squash merge of stuff

modules/programs/onepassword.nix

@@ -1,5 +1,16 @@
-{
-  flake.modules.homeManager.onepassword = {
-    # TODO: Port `_1password = true` behavior into an explicit Home Manager module.
+{ self, inputs, ... }: {
+  flake.modules.homeManager.onepassword = { config, pkgs, lib, ... }: {
+    home.file.".config/1Password/ssh/agent.toml".text = ''
+      # https://developer.1password.com/docs/ssh/agent/config
+      [[ssh-keys]]
+      vault = "Private"
+    '';
+    programs.ssh = {
+      enable = true;
+      extraConfig = ''
+        Host *
+            IdentityAgent ${config.home.homeDirectory}/.1password/agent.sock
+      '';
+    };
   };
-}
+}