refactor(tools): add execute_with_context() for ToolContext

ToolRegistry gains execute_with_context(&ToolContext) which bridges
to the existing execute(&ResponseContext) via a shim. The orchestrator
calls only the new method — no ResponseContext in its dependency tree.

src/tools/mod.rs

@@ -20,6 +20,7 @@ use tracing::debug;
 
 use crate::config::Config;
 use crate::context::ResponseContext;
+use crate::orchestrator::event::ToolContext;
 use crate::persistence::Store;
 use crate::sdk::gitea::GiteaClient;
 use crate::sdk::kratos::KratosClient;
@@ -278,6 +279,25 @@ impl ToolRegistry {
         allowed
     }
 
+    /// Execute a tool with transport-agnostic context (used by orchestrator).
+    pub async fn execute_with_context(
+        &self,
+        name: &str,
+        arguments: &str,
+        ctx: &ToolContext,
+    ) -> anyhow::Result<String> {
+        // Delegate to the existing execute with a shim ResponseContext
+        let response_ctx = ResponseContext {
+            matrix_user_id: String::new(),
+            user_id: ctx.user_id.clone(),
+            display_name: None,
+            is_dm: ctx.is_direct,
+            is_reply: false,
+            room_id: ctx.scope_key.clone(),
+        };
+        self.execute(name, arguments, &response_ctx).await
+    }
+
     pub async fn execute(
         &self,
         name: &str,