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/transcript.ts

@@ -0,0 +1,36 @@
+import type { TranscriptEntry, StdoutLineParser } from "./types";
+
+type RunLogChunk = { ts: string; stream: "stdout" | "stderr" | "system"; chunk: string };
+
+export function buildTranscript(chunks: RunLogChunk[], parser: StdoutLineParser): TranscriptEntry[] {
+  const entries: TranscriptEntry[] = [];
+  let stdoutBuffer = "";
+
+  for (const chunk of chunks) {
+    if (chunk.stream === "stderr") {
+      entries.push({ kind: "stderr", ts: chunk.ts, text: chunk.chunk });
+      continue;
+    }
+    if (chunk.stream === "system") {
+      entries.push({ kind: "system", ts: chunk.ts, text: chunk.chunk });
+      continue;
+    }
+
+    const combined = stdoutBuffer + chunk.chunk;
+    const lines = combined.split(/\r?\n/);
+    stdoutBuffer = lines.pop() ?? "";
+    for (const line of lines) {
+      const trimmed = line.trim();
+      if (!trimmed) continue;
+      entries.push(...parser(trimmed, chunk.ts));
+    }
+  }
+
+  const trailing = stdoutBuffer.trim();
+  if (trailing) {
+    const ts = chunks.length > 0 ? chunks[chunks.length - 1]!.ts : new Date().toISOString();
+    entries.push(...parser(trailing, ts));
+  }
+
+  return entries;
+}