perf: make DKG memory refresh demand driven

desktop/src-tauri/src/managed_agents/discovery.rs

@@ -482,16 +482,16 @@ fn profile_target_dirs(root: &Path) -> [PathBuf; 2] {
 }
 
 fn command_search_dirs() -> Vec<PathBuf> {
-    let mut dirs = profile_target_dirs(&workspace_root_dir()).to_vec();
+    // Packaged sidecars must win over compile-time workspace build output.
+    let mut dirs: Vec<_> = std::env::current_exe()
+        .ok()
+        .and_then(|path| path.parent().map(Path::to_path_buf))
+        .into_iter()
+        .collect();
+    dirs.extend(profile_target_dirs(&workspace_root_dir()));
     if let Ok(current_dir) = std::env::current_dir() {
         dirs.extend(profile_target_dirs(&current_dir));
     }
-
-    dirs.extend(
-        std::env::current_exe()
-            .ok()
-            .and_then(|path| path.parent().map(Path::to_path_buf)),
-    );
     dirs.into_iter().fold(Vec::new(), |mut unique, dir| {
         if !unique.contains(&dir) {
             unique.push(dir);

desktop/src/features/dkg-memory/hooks.ts

@@ -8,6 +8,7 @@ import {
   fetchTrustNetwork,
 } from "./api";
 import { fetchDkgMemoryCapabilities } from "./capabilities";
+import { dkgReadQueryPolicy } from "./queryLoadPolicy";
 
 const CAPABILITY_RETRY_DELAYS_MS = [250, 1_000, 5_000] as const;
 
@@ -61,7 +62,7 @@ export function useChannelMemory(
     queryKey: ["dkg-memory", "memory", channelId, cg],
     queryFn: () => fetchChannelMemory(channelId as string, cg ?? null),
     enabled: Boolean(channelId) && bindingResolved,
-    refetchInterval: 30 * 1000,
+    ...dkgReadQueryPolicy,
   });
 }
 
@@ -83,7 +84,7 @@ export function useTrustNetwork(channelId: string | null) {
     queryKey: ["dkg-memory", "trust-network", channelId],
     queryFn: () => fetchTrustNetwork(channelId as string),
     enabled: Boolean(channelId),
-    refetchInterval: 30 * 1000,
+    ...dkgReadQueryPolicy,
   });
 }
 
@@ -96,7 +97,7 @@ export function useReputationSummary(
     queryFn: () =>
       fetchReputationSummary(channelId as string, pubkey as string),
     enabled: Boolean(channelId && pubkey),
-    staleTime: 30 * 1_000,
+    ...dkgReadQueryPolicy,
   });
 }
 

desktop/src/features/dkg-memory/queryLoadPolicy.test.mjs

@@ -0,0 +1,18 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import {
+  DKG_READ_STALE_TIME_MS,
+  dkgReadQueryPolicy,
+} from "./queryLoadPolicy.ts";
+
+test("heavy DKG reads are cached briefly without polling or retry amplification", () => {
+  assert.equal(DKG_READ_STALE_TIME_MS, 30_000);
+  assert.deepEqual(dkgReadQueryPolicy, {
+    retry: false,
+    refetchInterval: false,
+    refetchOnReconnect: false,
+    refetchOnWindowFocus: false,
+    staleTime: 30_000,
+  });
+});

desktop/src/features/dkg-memory/queryLoadPolicy.ts

@@ -0,0 +1,14 @@
+/**
+ * DKG reads can fan out into several triple-store operations. Keep them
+ * user-driven and cache the successful result briefly instead of polling or
+ * multiplying an overloaded upstream with automatic retries.
+ */
+export const DKG_READ_STALE_TIME_MS = 30_000;
+
+export const dkgReadQueryPolicy = {
+  retry: false,
+  refetchInterval: false,
+  refetchOnReconnect: false,
+  refetchOnWindowFocus: false,
+  staleTime: DKG_READ_STALE_TIME_MS,
+} as const;

desktop/src/features/dkg-memory/ui/WebOfTrustPanel.tsx

@@ -4,6 +4,7 @@ import {
   History,
   Link2,
   Loader2,
+  RefreshCw,
   ShieldCheck,
   ShieldX,
   UserRoundCheck,
@@ -212,6 +213,17 @@ export function WebOfTrustPanel({
             ? network.error.message
             : "The community DKG did not return a trust network."}
         </p>
+        <Button
+          type="button"
+          size="xs"
+          variant="outline"
+          className="mt-3"
+          disabled={network.isFetching}
+          onClick={() => void network.refetch()}
+        >
+          <RefreshCw className={network.isFetching ? "animate-spin" : ""} />
+          Try again
+        </Button>
       </Card>
     );
   }
@@ -242,7 +254,20 @@ export function WebOfTrustPanel({
             signed vouches
           </p>
         </div>
-        <Badge variant="success">DKG evidence</Badge>
+        <div className="flex items-center gap-1.5">
+          <Badge variant="success">DKG evidence</Badge>
+          <Button
+            type="button"
+            variant="ghost"
+            size="icon-xs"
+            disabled={network.isFetching}
+            onClick={() => void network.refetch()}
+            title="Refresh trust evidence"
+            aria-label="Refresh trust evidence"
+          >
+            <RefreshCw className={network.isFetching ? "animate-spin" : ""} />
+          </Button>
+        </div>
       </div>
 
       {people.length === 0 ? (