fix(rust): the handoff says what the run did, not that a link exists (D156)

`install --game rust` ended every instance with "Rust server "alpha" is
connected to its sidecar" — printed unconditionally, before the plugin had
dialled anything, on a stopped server where it had not even loaded, and
beside "No service was registered, so nothing is listening yet". The
phase 18 walk read it as a claim and then found beta's plugin connected to
the wrong sidecar.

It now reads "Rust server "alpha" is set up." followed by either "The
plugin loads now; `doctor --game rust --server-id alpha` confirms it
connected." or "The plugin connects when the server next starts.".

The top-level --help no longer describes `install` as the uo-link sidecar
and overlay for both games, and says what `uninstall` removes for Rust.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

src/rustgame/install.rs

@@ -234,7 +234,7 @@ pub fn deploy(cli: &Cli, mode: Mode) -> Result<()> {
                 .unwrap_or(false),
         )?;
         record.instances.insert(plan.id.clone(), instance);
-        handoffs.push((plan.id.clone(), doc, registered));
+        handoffs.push((plan.id.clone(), doc, registered, plan.running));
     }
 
     // Instances this run did not touch still run the binary it just replaced.
@@ -306,10 +306,17 @@ pub fn deploy(cli: &Cli, mode: Mode) -> Result<()> {
     match mode {
         Mode::Install => {
             let host = crate::install::resolve_host(cli);
-            for (id, doc, registered) in &handoffs {
+            for (id, doc, registered, running) in &handoffs {
                 println!(
                     "{}",
-                    sidecar::handoff(id, doc, &host, cli.site_url.as_deref(), *registered)
+                    sidecar::handoff(
+                        id,
+                        doc,
+                        &host,
+                        cli.site_url.as_deref(),
+                        *registered,
+                        *running
+                    )
                 );
             }
         }