feat(launcher): harden native caching and telemetry; consolidate documentation

- Implemented SHA-256 integrity checks and stale temp purge in native download logic.\n- Enabled strict hash verification in background sync cycle.\n- Made CPU load gauge dynamic using real-time loadavg metadata.\n- Consolidated native app documentation into single master manual.\n- Marked legacy electron_native.js as deprecated.\n- Updated roadmap with temp cleanup and launch protection tasks.

src/routes/events/[event_id]/(launcher)/launcher_background_sync.svelte

@@ -150,7 +150,8 @@
                 const exists = await native.check_hash_file_cache({
                     cache_root,
                     hash: file_obj.hash_sha256,
-                    hash_prefix_length: prefix_len
+                    hash_prefix_length: prefix_len,
+                    verify_hash: true // Hardened check: Perform full SHA-256 verify if file exists
                 });
 
                 if (exists) {
@@ -238,7 +239,10 @@
 
             if (info) {
                 update_payload.info_hostname = info.hostname;
-                update_payload.info_ip_list = info.ip_addresses.join(', ');
+                // Safely handle IP list (bridge may return ip_addresses or networkInterfaces)
+                const ips = info.ip_addresses || [];
+                update_payload.info_ip_list = Array.isArray(ips) ? ips.join(', ') : 'Unknown';
+                
                 update_payload.meta_json = {
                     platform: info.platform,
                     release: info.release,