Trim the harness to what it needs to keep going

Host:
- test first: a new version is tested where it lies; only an installed
  version goes to versions/, and instances run from there
- data/ and public/ are shared by all versions; no snapshots; rollback
  restores code only
- no re-delivery, status.json, list, remove/archive, smoke test, data/
  hiding, or stdin timeout; rollback needs a version
- supervisor.rs split out; one place for installing a version
- init only writes the agent folder; run installs it like any actor
- console: @actor, text to the agent, /help, /quit

Agent:
- every text goes out as a broadcast; 5-line prompt; 5 tools that describe
  themselves; turn.json only marks an active turn

Docs: PROTOCOL.md, README.md, DECISIONS.md, AGENTS.md rewritten.
Examples: only notes and notes-v2.

cli/tests/common/mod.rs

@@ -246,26 +246,3 @@ pub async fn upgrade_actor(
     )
     .await
 }
-
-pub async fn wait_for_parked(world: &World, actor: &str, message_id: &str) {
-    tokio::time::timeout(Duration::from_secs(5), async {
-        loop {
-            let status_path = world.actor_dir(actor).join("status.json");
-            let parked_id = std::fs::read_to_string(status_path)
-                .ok()
-                .and_then(|text| serde_json::from_str::<Value>(&text).ok())
-                .and_then(|status| {
-                    status
-                        .pointer("/parked_message/id")
-                        .and_then(Value::as_str)
-                        .map(str::to_string)
-                });
-            if parked_id.as_deref() == Some(message_id) {
-                return;
-            }
-            tokio::time::sleep(Duration::from_millis(10)).await;
-        }
-    })
-    .await
-    .expect("actor did not park the crashed message");
-}