fix: reprovision workflow bugs — SSH host key warnings, log following, status priority

- Add UserKnownHostsFile=/dev/null to SSH in debug and reprovision commands
- Track install state in log follower so it doesn't exit prematurely on "installed"
- Reorder bastion status check to prioritize active queue over stale installed state
- Update .gitignore with task file entries

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

bastion/src/labd/src/routes/bastions.ts

@@ -257,17 +257,7 @@ export function registerBastionRoutes(app: FastifyInstance, db: DbClient): void
     const queued = bastion.state.install_queue[mac];
     const installed = bastion.state.installed[mac];
 
-    if (installed) {
-      return {
-        mac,
-        hostname: installed.hostname,
-        status: "installed",
-        role: installed.role,
-        ip: installed.ip,
-        installed_at: installed.installed_at,
-      };
-    }
-
+    // Active install takes priority over old installed state (reprovision case)
     if (queued) {
       return {
         mac,
@@ -282,6 +272,17 @@ export function registerBastionRoutes(app: FastifyInstance, db: DbClient): void
       };
     }
 
+    if (installed) {
+      return {
+        mac,
+        hostname: installed.hostname,
+        status: "installed",
+        role: installed.role,
+        ip: installed.ip,
+        installed_at: installed.installed_at,
+      };
+    }
+
     return reply.code(404).send({ error: `MAC ${mac} not found in install queue or installed` });
   });
 }