fix: fixed prompt parsing, startup tracing, and help-command behavior

- Fixed help rendering so `--help` no longer triggers unrelated command loaders.
- Fixed startup span logging to emit markers only with PI_DEBUG_STARTUP set.
- Fixed logger startup trace behavior for `:start`, `:done`, and `:fail` phases.
- Fixed prompt template processing with cached raw-template compilation and safer formatting.
- Optimized symbol and tag parsing in prompt templates via manual parsers.

packages/coding-agent/src/ssh/connection-manager.ts

@@ -355,6 +355,33 @@ export async function getHostInfoForHost(host: SSHConnectionTarget): Promise<SSH
 	return await loadHostInfoFromDisk(host);
 }
 
+/**
+ * Synchronous, probe-free host info lookup for startup paths.
+ *
+ * Checks the in-memory cache, then falls back to a synchronous read of the
+ * persisted host-info cache file. Never opens a connection or probes the
+ * remote host — callers get `undefined` when nothing is cached yet.
+ */
+export function getCachedHostInfoSync(host: SSHConnectionTarget): SSHHostInfo | undefined {
+	const cached = hostInfoCache.get(host.name);
+	if (cached) {
+		const resolved = applyCompatOverride(host, cached);
+		if (resolved !== cached) hostInfoCache.set(host.name, resolved);
+		return resolved;
+	}
+	try {
+		const parsed = parseHostInfo(JSON.parse(fs.readFileSync(getHostInfoPath(host.name), "utf-8")));
+		if (!parsed) return undefined;
+		const resolved = applyCompatOverride(host, parsed);
+		hostInfoCache.set(host.name, resolved);
+		return resolved;
+	} catch (err) {
+		if (isEnoent(err)) return undefined;
+		logger.warn("Failed to load SSH host info", { host: host.name, error: String(err) });
+		return undefined;
+	}
+}
+
 export async function ensureHostInfo(host: SSHConnectionTarget): Promise<SSHHostInfo> {
 	const cached = hostInfoCache.get(host.name);
 	if (cached) {