Merge remote-tracking branch 'origin/staging' into feat/multi-tenant-isolation-phases-2-4

src/agent/agent_loop.rs

@@ -169,6 +169,9 @@ pub struct AgentDeps {
     pub sandbox_readiness: crate::agent::routine_engine::SandboxReadiness,
     /// Software builder for self-repair tool rebuilding.
     pub builder: Option<Arc<dyn crate::tools::SoftwareBuilder>>,
+    /// Resolved LLM backend identifier (e.g., "nearai", "openai", "groq").
+    /// Used by `/model` persistence to determine which env var to update.
+    pub llm_backend: String,
 }
 
 /// The main agent that coordinates all components.