feat(tmux): add terminal overlay binding with leader+t

This reverts commit dd111756cf.

home/default.nix

@@ -7,6 +7,7 @@
     ./modules/git.nix
     ./modules/tmux.nix
     ./modules/scripts.nix
+    ./modules/opencode.nix
   ];
 
   # ============================================
@@ -32,6 +33,7 @@
     podman-compose
     # AI
     claude-code
+    opencode
 
     # Custom packages
     (pkgs.callPackage ../pkgs/ax {})

home/modules/opencode.nix

@@ -0,0 +1,74 @@
+{ config, ... }:
+
+{
+  xdg.configFile."opencode/opencode.json".text = builtins.toJSON {
+    "$schema" = "https://opencode.ai/config.json";
+    provider = {
+      openrouter = {
+        models = {
+          "openrouter/openai/gpt-oss-120b" = {
+            options = {
+              provider = {
+                order = [ "groq" "cerebras" ];
+                allow_fallbacks = true;
+              };
+            };
+          };
+          "openrouter/moonshotai/kimi-k2.5" = {
+            options = {
+              provider = {
+                order = [ "Nitro" ];
+                allow_fallbacks = true;
+              };
+            };
+          };
+        };
+      };
+    };
+    agent = {
+      commit = {
+        description = "Creates a one-line git commit describing the changes";
+        mode = "primary";
+        model = "openrouter/openai/gpt-oss-120b";
+        prompt = ''
+          You are a git commit agent. When invoked:
+          1. Run `git status` and `git diff` to understand all changes
+          2. Stage appropriate files with `git add`
+          3. Create a single one-line commit message that clearly describes the changes
+          4. Never push to remote
+          5. Never use --no-verify or --force flags
+        '';
+        permission = {
+          bash = {
+            "git *" = "allow";
+          };
+          edit = "allow";
+        };
+      };
+      compact = {
+        description = "Compacts and summarizes conversation context to reduce token usage";
+        mode = "primary";
+        model = "openrouter/openai/gpt-oss-120b";
+        prompt = ''
+          You are a context compaction specialist. Your job is to summarize and compress the conversation history while preserving:
+          1. Key decisions and their rationale
+          2. Important code changes and their purposes
+          3. Unresolved issues or TODOs
+          4. File paths and line references that are still relevant
+
+          Be extremely concise. Remove:
+          - Redundant explanations
+          - Already-applied code diffs
+          - Exploration steps that didn't lead anywhere
+          - Verbose tool outputs
+
+          Output a dense, information-rich summary that captures the essential state of the conversation.
+        '';
+        permission = {
+          edit = "deny";
+          bash = { "*" = "deny"; };
+        };
+      };
+    };
+  };
+}

home/modules/tmux.nix

@@ -62,6 +62,7 @@
       bind -r l select-pane -R
       bind -r r source-file ~/.config/tmux/tmux.conf \; display-message "tmux.conf reloaded"
       bind q display-popup -E -w 60% -h 60% -d '#{session_path}' 'nvim quicknote.md'
+      bind t display-popup -E -w 60% -h 60% -d '#{pane_current_path}' '$SHELL'
     '';
   };
 }

nixos/modules/development.nix

@@ -15,7 +15,7 @@
 
     languagePackages = {
       rust = with pkgs; [ rustup cargo-deny cargo-edit ];
-      python = with pkgs; [ python3 python3Packages.pip python3Packages.virtualenv uv ];
+      python = with pkgs; [ python3 python3Packages.pip python3Packages.virtualenv uv mypy ];
       nodejs = with pkgs; [ nodejs pnpm ];
       go = with pkgs; [ go golangci-lint ];
       ruby = with pkgs; [ ruby bundler ];