feat(28-02): create ollamaApi client and Hermes Ollama model dropdown

- Add ui/src/api/ollama.ts with ollamaApi.status() and ollamaApi.models()
- Replace free-text Model input with hybrid dropdown/fallback in HermesLocalConfigFields
- Dropdown shows pulled Ollama models with * prefix for recommended entries
- Install callout shown when Ollama is absent (with link to installUrl)
- Edit mode: selecting an Ollama model atomically sets model + provider:custom + base_url
- Manual entry fallback via "Other (manual entry)..." option or when Ollama absent
- Uses useCompany() hook for companyId (consistent with AgentConfigForm pattern)

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

@@ -1,9 +1,13 @@
+import { useState } from "react";
+import { useQuery } from "@tanstack/react-query";
 import type { AdapterConfigFieldsProps } from "../types";
 import {
   Field,
   DraftInput,
 } from "../../components/agent-config-primitives";
 import { ChoosePathButton } from "../../components/PathInstructionsModal";
+import { useCompany } from "../../context/CompanyContext";
+import { ollamaApi } from "../../api/ollama";
 
 const inputClass =
   "w-full rounded-md border border-border px-2.5 py-1.5 bg-transparent outline-none text-sm font-mono placeholder:text-muted-foreground/40";
@@ -19,6 +23,63 @@ export function HermesLocalConfigFields({
   mark,
   hideInstructionsFile,
 }: AdapterConfigFieldsProps) {
+  const { selectedCompanyId } = useCompany();
+  const companyId = selectedCompanyId;
+
+  const [manualEntry, setManualEntry] = useState(false);
+
+  const { data: ollamaStatus } = useQuery({
+    queryKey: ["ollama", "status", companyId],
+    queryFn: () => ollamaApi.status(companyId!),
+    enabled: Boolean(companyId),
+    staleTime: 60_000,
+  });
+
+  const { data: ollamaModels } = useQuery({
+    queryKey: ["ollama", "models", companyId],
+    queryFn: () => ollamaApi.models(companyId!),
+    enabled: Boolean(companyId && ollamaStatus?.installed),
+    staleTime: 60_000,
+  });
+
+  const currentModel = isCreate
+    ? (values!.model ?? "")
+    : eff("adapterConfig", "model", String(config.model ?? ""));
+
+  function handleSelectModel(selectedModel: string) {
+    if (selectedModel === "__manual__") {
+      setManualEntry(true);
+      return;
+    }
+    if (selectedModel === "") return;
+    // Set fields when selecting an Ollama model
+    if (isCreate) {
+      // In create mode, CreateConfigValues does not have provider/base_url;
+      // only model is stored via form values. The server resolves provider
+      // at runtime from the model name or ~/.hermes/config.yaml.
+      set!({ model: selectedModel });
+    } else {
+      // In edit mode, set all three fields atomically on adapterConfig
+      mark("adapterConfig", "model", selectedModel);
+      mark("adapterConfig", "provider", "custom");
+      mark("adapterConfig", "base_url", "http://localhost:11434/v1");
+    }
+  }
+
+  function formatModelLabel(m: { name: string; parameterSize: string; quantization: string; recommended: boolean; recommendationReason: string | null }) {
+    const params = m.parameterSize ? ` (${m.parameterSize}, ${m.quantization})` : "";
+    const recSuffix = m.recommended ? " - Recommended for your system" : "";
+    const star = m.recommended ? "* " : "";
+    return `${star}${m.name}${params}${recSuffix}`;
+  }
+
+  const showDropdown =
+    ollamaStatus?.installed === true &&
+    (ollamaModels?.models?.length ?? 0) > 0 &&
+    !manualEntry;
+
+  const showInstallCallout = ollamaStatus?.installed === false;
+
   return (
     <>
       {!hideInstructionsFile && (
@@ -47,26 +108,59 @@ export function HermesLocalConfigFields({
           </div>
         </Field>
       )}
+
       <Field
         label="Model"
-        hint="Provider/model format (e.g. anthropic/claude-sonnet-4). Leave blank to use Hermes default."
+        hint={
+          showDropdown
+            ? "Select a locally pulled Ollama model. Recommended models are marked with *."
+            : "Provider/model format (e.g. anthropic/claude-sonnet-4). Leave blank to use Hermes default."
+        }
       >
-        <DraftInput
-          value={
-            isCreate
-              ? values!.model ?? ""
-              : eff("adapterConfig", "model", String(config.model ?? ""))
-          }
-          onCommit={(v) =>
-            isCreate
-              ? set!({ model: v })
-              : mark("adapterConfig", "model", v || undefined)
-          }
-          immediate
-          className={inputClass}
-          placeholder="anthropic/claude-sonnet-4"
-        />
+        {showInstallCallout && (
+          <div className="mb-2 rounded-md border border-amber-500/30 bg-amber-500/5 p-3 text-sm">
+            <span className="text-amber-200">Ollama is not detected. </span>
+            <a
+              href={ollamaStatus.installUrl ?? "https://ollama.com/download"}
+              target="_blank"
+              rel="noopener noreferrer"
+              className="text-amber-400 underline hover:text-amber-300"
+            >
+              Install Ollama
+            </a>
+            <span className="text-muted-foreground"> to use local models.</span>
+          </div>
+        )}
+
+        {showDropdown ? (
+          <select
+            className={inputClass}
+            value={currentModel || ""}
+            onChange={(e) => handleSelectModel(e.target.value)}
+          >
+            <option value="">Select a model...</option>
+            {(ollamaModels?.models ?? []).map((m) => (
+              <option key={m.name} value={m.name}>
+                {formatModelLabel(m)}
+              </option>
+            ))}
+            <option value="__manual__">Other (manual entry)...</option>
+          </select>
+        ) : (
+          <DraftInput
+            value={currentModel}
+            onCommit={(v) =>
+              isCreate
+                ? set!({ model: v })
+                : mark("adapterConfig", "model", v || undefined)
+            }
+            immediate
+            className={inputClass}
+            placeholder="anthropic/claude-sonnet-4"
+          />
+        )}
       </Field>
+
       {!isCreate && (
         <>
           <Field

ui/src/api/ollama.ts

@@ -0,0 +1,31 @@
+import { api } from "./client";
+
+export interface OllamaStatus {
+  installed: boolean;
+  version: string | null;
+  installUrl: string;
+}
+
+export interface OllamaModel {
+  name: string;
+  parameterSize: string;
+  quantization: string;
+  sizeBytes: number;
+  family: string;
+  recommended: boolean;
+  recommendationReason: string | null;
+}
+
+export interface OllamaModelsResponse {
+  models: OllamaModel[];
+  ramGb: number;
+}
+
+export const ollamaApi = {
+  status(companyId: string): Promise<OllamaStatus> {
+    return api.get<OllamaStatus>(`/companies/${companyId}/ollama/status`);
+  },
+  models(companyId: string): Promise<OllamaModelsResponse> {
+    return api.get<OllamaModelsResponse>(`/companies/${companyId}/ollama/models`);
+  },
+};