feat(proxy): add scoped proxy configuration and docs runbooks

- add scope-aware proxy schema and runtime wiring for providers/channels/tools

- add agent callable proxy_config tool for fast proxy setup

- standardize docs system with index, template, and playbooks

src/tools/mod.rs

@@ -19,6 +19,7 @@ pub mod image_info;
 pub mod memory_forget;
 pub mod memory_recall;
 pub mod memory_store;
+pub mod proxy_config;
 pub mod pushover;
 pub mod schedule;
 pub mod schema;
@@ -48,6 +49,7 @@ pub use image_info::ImageInfoTool;
 pub use memory_forget::MemoryForgetTool;
 pub use memory_recall::MemoryRecallTool;
 pub use memory_store::MemoryStoreTool;
+pub use proxy_config::ProxyConfigTool;
 pub use pushover::PushoverTool;
 pub use schedule::ScheduleTool;
 #[allow(unused_imports)]
@@ -144,6 +146,7 @@ pub fn all_tools_with_runtime(
         Box::new(MemoryRecallTool::new(memory.clone())),
         Box::new(MemoryForgetTool::new(memory, security.clone())),
         Box::new(ScheduleTool::new(security.clone(), root_config.clone())),
+        Box::new(ProxyConfigTool::new(config.clone(), security.clone())),
         Box::new(GitOperationsTool::new(
             security.clone(),
             workspace_dir.to_path_buf(),
@@ -292,6 +295,7 @@ mod tests {
         assert!(!names.contains(&"browser_open"));
         assert!(names.contains(&"schedule"));
         assert!(names.contains(&"pushover"));
+        assert!(names.contains(&"proxy_config"));
     }
 
     #[test]
@@ -330,6 +334,7 @@ mod tests {
         let names: Vec<&str> = tools.iter().map(|t| t.name()).collect();
         assert!(names.contains(&"browser_open"));
         assert!(names.contains(&"pushover"));
+        assert!(names.contains(&"proxy_config"));
     }
 
     #[test]