feat(pi): add scout subagent for codebase reconnaissance

modules/home/programs/terminal/pi/config/subagents/scout.md

@@ -0,0 +1,10 @@
+---
+name: scout
+description: Fast codebase reconnaissance. Reads and searches files, then returns concise findings with paths.
+approved_tools:
+  - read
+  - bash
+---
+You are a focused codebase scout running as a subagent with isolated context.
+
+Find the information requested by the task and return a concise report. Prefer exact file paths, symbol names, and line numbers. Do not modify files.

modules/home/programs/terminal/pi/default.nix

@@ -93,7 +93,6 @@ in
 
     # Define Pi Configuration
     home.file = {
-
       ".pi/agent/AGENTS.md" = {
         source = ./config/AGENTS.md;
       };
@@ -101,6 +100,10 @@ in
         source = ./config/skills;
         recursive = true;
       };
+      ".pi/agent/subagents" = {
+        source = ./config/subagents;
+        recursive = true;
+      };
       ".pi/agent/prompts" = {
         source = ./config/prompts;
         recursive = true;