[nexus] feat(20-01): expand HermesLocalConfigFields with model, toolsets, persistSession, timeoutSec

- Add Model field (both create + edit modes) using CreateConfigValues.model
- Add Toolsets field (both create + edit modes) using extraArgs in create, adapterConfig.toolsets in edit
- Add Persist Session checkbox (edit mode only) wired to adapterConfig.persistSession
- Add Timeout (seconds) field (edit mode only) wired to adapterConfig.timeoutSec
- Restructure component to use fragment with conditional hideInstructionsFile guard
- TypeScript compiles cleanly

ui/src/adapters/hermes-local/config-fields.tsx

@@ -19,31 +19,110 @@ export function HermesLocalConfigFields({
   mark,
   hideInstructionsFile,
 }: AdapterConfigFieldsProps) {
-  if (hideInstructionsFile) return null;
   return (
-    <Field label="Agent instructions file" hint={instructionsFileHint}>
+    <>
-      <div className="flex items-center gap-2">
+      {!hideInstructionsFile && (
+        <Field label="Agent instructions file" hint={instructionsFileHint}>
+          <div className="flex items-center gap-2">
+            <DraftInput
+              value={
+                isCreate
+                  ? values!.instructionsFilePath ?? ""
+                  : eff(
+                      "adapterConfig",
+                      "instructionsFilePath",
+                      String(config.instructionsFilePath ?? ""),
+                    )
+              }
+              onCommit={(v) =>
+                isCreate
+                  ? set!({ instructionsFilePath: v })
+                  : mark("adapterConfig", "instructionsFilePath", v || undefined)
+              }
+              immediate
+              className={inputClass}
+              placeholder="/absolute/path/to/AGENTS.md"
+            />
+            <ChoosePathButton />
+          </div>
+        </Field>
+      )}
+      <Field
+        label="Model"
+        hint="Provider/model format (e.g. anthropic/claude-sonnet-4). Leave blank to use Hermes default."
+      >
         <DraftInput
           value={
             isCreate
-              ? values!.instructionsFilePath ?? ""
+              ? values!.model ?? ""
-              : eff(
+              : eff("adapterConfig", "model", String(config.model ?? ""))
-                  "adapterConfig",
-                  "instructionsFilePath",
-                  String(config.instructionsFilePath ?? ""),
-                )
           }
           onCommit={(v) =>
             isCreate
-              ? set!({ instructionsFilePath: v })
+              ? set!({ model: v })
-              : mark("adapterConfig", "instructionsFilePath", v || undefined)
+              : mark("adapterConfig", "model", v || undefined)
           }
           immediate
           className={inputClass}
-          placeholder="/absolute/path/to/AGENTS.md"
+          placeholder="anthropic/claude-sonnet-4"
         />
-        <ChoosePathButton />
+      </Field>
-      </div>
+      <Field
-    </Field>
+        label="Toolsets"
+        hint="Comma-separated toolset names (e.g. terminal,file,web). Leave blank for defaults."
+      >
+        <DraftInput
+          value={
+            isCreate
+              ? values!.extraArgs ?? ""
+              : eff("adapterConfig", "toolsets", String(config.toolsets ?? ""))
+          }
+          onCommit={(v) =>
+            isCreate
+              ? set!({ extraArgs: v })
+              : mark("adapterConfig", "toolsets", v || undefined)
+          }
+          immediate
+          className={inputClass}
+          placeholder="terminal,file,web"
+        />
+      </Field>
+      {!isCreate && (
+        <>
+          <Field
+            label="Persist session"
+            hint="Keep conversation history between heartbeat runs."
+          >
+            <label className="flex items-center gap-2 cursor-pointer">
+              <input
+                type="checkbox"
+                className="h-4 w-4 rounded border-border accent-primary"
+                checked={eff("adapterConfig", "persistSession", config.persistSession !== false)}
+                onChange={(e) =>
+                  mark("adapterConfig", "persistSession", e.target.checked)
+                }
+              />
+              <span className="text-sm text-muted-foreground">Enabled</span>
+            </label>
+          </Field>
+          <Field
+            label="Timeout (seconds)"
+            hint="Maximum execution time per heartbeat run."
+          >
+            <DraftInput
+              value={String(
+                eff("adapterConfig", "timeoutSec", Number(config.timeoutSec ?? 300)),
+              )}
+              onCommit={(v) =>
+                mark("adapterConfig", "timeoutSec", Number(v) || 300)
+              }
+              immediate
+              className={inputClass}
+              placeholder="300"
+            />
+          </Field>
+        </>
+      )}
+    </>
   );
 }