docs: reorganize docs — archive outdated, create brainstorming folder

- Create docs/brainstorming/ with 5 discussion records (Mar 16 - Apr 7)
- Archive ~30 outdated audit reports (V5-V11) to docs/archive/old-audits/
- Archive superseded analysis docs to docs/archive/old-analysis/
- Archive completed session plans to docs/archive/old-plans/
- Archive old test reports/validations to respective archive folders
- Remove empty directories left after moves
- Keep current docs: TRUTH.md, feature docs, deployment, knowledge-base, superpowers

desktop/src-tauri/src/kernel_commands/a2a.rs

@@ -1,6 +1,5 @@
 //! A2A (Agent-to-Agent) commands — gated behind `multi-agent` feature
 
-use serde::Serialize;
 use serde_json;
 use tauri::State;
 use zclaw_types::AgentId;
@@ -120,16 +119,6 @@ pub async fn agent_a2a_delegate_task(
 // Butler Delegation Command — multi-agent feature
 // ============================================================
 
-/// Result of butler task delegation (mirrors zclaw_kernel::director::DelegationResult).
-#[cfg(feature = "multi-agent")]
-#[derive(Debug, Serialize)]
-struct ButlerDelegationResponse {
-    request: String,
-    tasks: Vec<serde_json::Value>,
-    success: bool,
-    summary: String,
-}
-
 /// Butler delegates a user request to expert agents via the Director.
 #[cfg(feature = "multi-agent")]
 // @connected