Auto-join groups: /g and /gjoin auto-create if group doesn't exist

- Server: /join endpoint creates the group if it doesn't exist
- CLI TUI: /g <name> auto-joins before switching
- Web: /g <name> auto-joins before switching
- No more "group not found" errors — just /g ops and go

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/crates/warzone-client/src/tui/app.rs

@@ -204,6 +204,8 @@ impl App {
         }
         if text.starts_with("/g ") {
             let name = text[3..].trim().to_string();
+            // Auto-join
+            self.group_join(&name, client).await;
             self.add_message(ChatLine {
                 sender: "system".into(),
                 text: format!("Switched to group #{}", name),

warzone/crates/warzone-server/src/routes/groups.rs

@@ -102,16 +102,25 @@ async fn join_group(
 ) -> AppResult<Json<serde_json::Value>> {
     let fp = normalize_fp(&req.fingerprint);
 
+    // Auto-create if group doesn't exist
     let mut group = match load_group(&state.db.groups, &name) {
         Some(g) => g,
-        None => return Ok(Json(serde_json::json!({ "error": "group not found" }))),
+        None => {
+            let g = GroupInfo {
+                name: name.clone(),
+                creator: fp.clone(),
+                members: vec![],
+            };
+            tracing::info!("Group '{}' auto-created by {}", name, fp);
+            g
+        }
     };
 
     if !group.members.contains(&fp) {
         group.members.push(fp.clone());
-        save_group(&state.db.groups, &group)?;
+        tracing::info!("{} joined group '{}' ({} members)", fp, name, group.members.len());
-        tracing::info!("{} joined group '{}'", fp, name);
     }
+    save_group(&state.db.groups, &group)?;
 
     Ok(Json(serde_json::json!({ "ok": true, "members": group.members.len() })))
 }

warzone/crates/warzone-server/src/routes/web.rs

@@ -413,6 +413,8 @@ async function groupJoin(name) {
 }
 
 async function groupSwitch(name) {
+  // Auto-join
+  await groupJoin(name);
   const resp = await fetch(SERVER + '/v1/groups/' + name);
   const data = await resp.json();
   if (data.error) { addSys('Error: ' + data.error); return; }