fix(rgov): use path-only href instead of /${space}/ prefix

Spaces are subdomains, not path segments. /rspace is correct since
the space context comes from the subdomain.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

modules/rgov/mod.ts

@@ -41,7 +41,7 @@ routes.get("/", (c) => {
 					<li><strong>Projects</strong> — Circuit aggregators showing "X of Y gates satisfied"</li>
 					<li><strong>Amendments</strong> — Propose in-place circuit modifications</li>
 				</ul>
-				<a href="/${space}/rspace" style="display:inline-block;background:linear-gradient(to right,#7c3aed,#1d4ed8);color:white;padding:10px 20px;border-radius:8px;text-decoration:none;font-weight:600;">
+				<a href="/rspace" style="display:inline-block;background:linear-gradient(to right,#7c3aed,#1d4ed8);color:white;padding:10px 20px;border-radius:8px;text-decoration:none;font-weight:600;">
 					Open Canvas →
 				</a>
 			</div>