Extract adapter registry across CLI, server, and UI

Refactor monolithic heartbeat service, AgentConfigForm, and CLI
heartbeat-run into a proper adapter registry pattern. Each adapter
type (process, claude-local, codex-local, http) gets its own module
with server-side execution logic, CLI invocation, and UI config form.
Significantly reduces file sizes and enables adding new adapters
without touching core code.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ui/src/adapters/http/build-config.ts

@@ -0,0 +1,9 @@
+import type { CreateConfigValues } from "../../components/AgentConfigForm";
+
+export function buildHttpConfig(v: CreateConfigValues): Record<string, unknown> {
+  const ac: Record<string, unknown> = {};
+  if (v.url) ac.url = v.url;
+  ac.method = "POST";
+  ac.timeoutMs = 15000;
+  return ac;
+}

ui/src/adapters/http/config-fields.tsx

@@ -0,0 +1,38 @@
+import type { AdapterConfigFieldsProps } from "../types";
+import {
+  Field,
+  DraftInput,
+  help,
+} from "../../components/agent-config-primitives";
+
+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";
+
+export function HttpConfigFields({
+  isCreate,
+  values,
+  set,
+  config,
+  eff,
+  mark,
+}: AdapterConfigFieldsProps) {
+  return (
+    <Field label="Webhook URL" hint={help.webhookUrl}>
+      <DraftInput
+        value={
+          isCreate
+            ? values!.url
+            : eff("adapterConfig", "url", String(config.url ?? ""))
+        }
+        onCommit={(v) =>
+          isCreate
+            ? set!({ url: v })
+            : mark("adapterConfig", "url", v || undefined)
+        }
+        immediate
+        className={inputClass}
+        placeholder="https://..."
+      />
+    </Field>
+  );
+}

ui/src/adapters/http/index.ts

@@ -0,0 +1,12 @@
+import type { UIAdapterModule } from "../types";
+import { parseHttpStdoutLine } from "./parse-stdout";
+import { HttpConfigFields } from "./config-fields";
+import { buildHttpConfig } from "./build-config";
+
+export const httpUIAdapter: UIAdapterModule = {
+  type: "http",
+  label: "HTTP Webhook",
+  parseStdoutLine: parseHttpStdoutLine,
+  ConfigFields: HttpConfigFields,
+  buildAdapterConfig: buildHttpConfig,
+};

ui/src/adapters/http/parse-stdout.ts

@@ -0,0 +1,5 @@
+import type { TranscriptEntry } from "../types";
+
+export function parseHttpStdoutLine(line: string, ts: string): TranscriptEntry[] {
+  return [{ kind: "stdout", ts, text: line }];
+}