Add OpenCode provider integration and strict model selection

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

@@ -0,0 +1,47 @@
+import type { AdapterConfigFieldsProps } from "../types";
+import {
+  Field,
+  DraftInput,
+} from "../../components/agent-config-primitives";
+import { ChoosePathButton } from "../../components/PathInstructionsModal";
+
+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";
+const instructionsFileHint =
+  "Absolute path to a markdown file (e.g. AGENTS.md) that defines this agent's behavior. Injected into the system prompt at runtime.";
+
+export function OpenCodeLocalConfigFields({
+  isCreate,
+  values,
+  set,
+  config,
+  eff,
+  mark,
+}: AdapterConfigFieldsProps) {
+  return (
+    <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>
+  );
+}

ui/src/adapters/opencode-local/index.ts

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+import type { UIAdapterModule } from "../types";
+import { parseOpenCodeStdoutLine } from "@paperclipai/adapter-opencode-local/ui";
+import { OpenCodeLocalConfigFields } from "./config-fields";
+import { buildOpenCodeLocalConfig } from "@paperclipai/adapter-opencode-local/ui";
+
+export const openCodeLocalUIAdapter: UIAdapterModule = {
+  type: "opencode_local",
+  label: "OpenCode (local)",
+  parseStdoutLine: parseOpenCodeStdoutLine,
+  ConfigFields: OpenCodeLocalConfigFields,
+  buildAdapterConfig: buildOpenCodeLocalConfig,
+};