feat(agent-api): GET /api/agent/cards/:cardId

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/app/api/agent/cards/[cardId]/route.ts

@@ -0,0 +1,88 @@
+import { getAdminPb } from "@/lib/pb/admin";
+import { requireAgentToken } from "@/lib/agent/auth";
+import { jsonError, jsonOk } from "@/lib/http/json";
+import type {
+  CardRecord,
+  ColumnRecord,
+  CommentRecord,
+  CommitRecord,
+  SubtaskRecord,
+  UserRecord,
+} from "@/lib/pb/types";
+
+/**
+ * GET /api/agent/cards/:cardId — one card's full detail: everything the list
+ * endpoint returns, plus its existing checklist, existing comments (with
+ * author names resolved), and its 10 most recent linked commits — enough for
+ * an agent to know what has already touched this card before drafting a plan
+ * for it, without pulling full commit history.
+ */
+export async function GET(
+  request: Request,
+  context: { params: Promise<{ cardId: string }> }
+): Promise<Response> {
+  const denied = requireAgentToken(request);
+  if (denied) return denied;
+
+  const { cardId } = await context.params;
+  const pb = await getAdminPb();
+
+  const card = await pb.collection("cards").getOne<CardRecord>(cardId).catch(() => null);
+  if (!card || card.archived) return jsonError("Card not found", 404);
+
+  const column = await pb
+    .collection("columns")
+    .getOne<ColumnRecord>(card.column)
+    .catch(() => null);
+
+  const subtasks = await pb.collection("subtasks").getFullList<SubtaskRecord>({
+    filter: `card = "${cardId}"`,
+    sort: "position",
+  });
+
+  const comments = await pb.collection("comments").getFullList<CommentRecord>({
+    filter: `card = "${cardId}"`,
+    sort: "created",
+  });
+
+  const userIds = new Set(comments.map((c) => c.author).filter(Boolean));
+  const names: Record<string, string> = {};
+  for (const id of userIds) {
+    const user = await pb.collection("users").getOne<UserRecord>(id).catch(() => null);
+    names[id] = user?.name || user?.email || "Someone";
+  }
+
+  const recentCommits = await pb.collection("commits").getList<CommitRecord>(1, 10, {
+    filter: `card = "${cardId}" && is_merge = false`,
+    sort: "-authored_at",
+  });
+
+  return jsonOk({
+    id: card.id,
+    number: card.number,
+    title: card.title,
+    description: card.description,
+    priority: card.priority,
+    target_date: card.target_date,
+    size_band: card.size_band,
+    column: column
+      ? {
+          id: column.id,
+          name: column.name,
+          is_inbox: column.is_inbox,
+          is_done: column.is_done,
+        }
+      : null,
+    subtasks: subtasks.map((s) => ({ id: s.id, title: s.title, done: s.done })),
+    comments: comments.map((c) => ({
+      id: c.id,
+      author: names[c.author] ?? "Someone",
+      body: c.body,
+      created: c.created,
+    })),
+    recentCommits: recentCommits.items.map((commit) => ({
+      summary: commit.summary || commit.subject,
+      authored_at: commit.authored_at,
+    })),
+  });
+}