Merge remote-tracking branch 'public-gh/master' into paperclip-subissues

* public-gh/master:
  Drop lockfile from watcher change
  Tighten plugin dev file watching
  Fix plugin smoke example typecheck
  Fix plugin dev watcher and migration snapshot
  Clarify plugin authoring and external dev workflow
  Expand kitchen sink plugin demos
  fix: set AGENT_HOME env var for agent processes
  Add kitchen sink plugin example
  Simplify plugin runtime and cleanup lifecycle
  Add plugin framework and settings UI

# Conflicts:
#	packages/db/src/migrations/meta/0029_snapshot.json
#	packages/db/src/migrations/meta/_journal.json

server/src/__tests__/plugin-dev-watcher.test.ts

@@ -0,0 +1,68 @@
+import { mkdtempSync, mkdirSync, rmSync, writeFileSync } from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { afterEach, describe, expect, it } from "vitest";
+import { resolvePluginWatchTargets } from "../services/plugin-dev-watcher.js";
+
+const tempDirs: string[] = [];
+
+afterEach(() => {
+  while (tempDirs.length > 0) {
+    const dir = tempDirs.pop();
+    if (dir) rmSync(dir, { recursive: true, force: true });
+  }
+});
+
+function makeTempPluginDir(): string {
+  const dir = mkdtempSync(path.join(os.tmpdir(), "paperclip-plugin-watch-"));
+  tempDirs.push(dir);
+  return dir;
+}
+
+describe("resolvePluginWatchTargets", () => {
+  it("watches package metadata plus concrete declared runtime files", () => {
+    const pluginDir = makeTempPluginDir();
+    mkdirSync(path.join(pluginDir, "dist", "ui"), { recursive: true });
+    writeFileSync(
+      path.join(pluginDir, "package.json"),
+      JSON.stringify({
+        name: "@acme/example",
+        paperclipPlugin: {
+          manifest: "./dist/manifest.js",
+          worker: "./dist/worker.js",
+          ui: "./dist/ui",
+        },
+      }),
+    );
+    writeFileSync(path.join(pluginDir, "dist", "manifest.js"), "export default {};\n");
+    writeFileSync(path.join(pluginDir, "dist", "worker.js"), "export default {};\n");
+    writeFileSync(path.join(pluginDir, "dist", "ui", "index.js"), "export default {};\n");
+    writeFileSync(path.join(pluginDir, "dist", "ui", "index.css"), "body {}\n");
+
+    const targets = resolvePluginWatchTargets(pluginDir);
+
+    expect(targets).toEqual([
+      { path: path.join(pluginDir, "dist", "manifest.js"), recursive: false, kind: "file" },
+      { path: path.join(pluginDir, "dist", "ui", "index.css"), recursive: false, kind: "file" },
+      { path: path.join(pluginDir, "dist", "ui", "index.js"), recursive: false, kind: "file" },
+      { path: path.join(pluginDir, "dist", "worker.js"), recursive: false, kind: "file" },
+      { path: path.join(pluginDir, "package.json"), recursive: false, kind: "file" },
+    ]);
+  });
+
+  it("falls back to dist when package metadata does not declare entrypoints", () => {
+    const pluginDir = makeTempPluginDir();
+    mkdirSync(path.join(pluginDir, "dist", "nested"), { recursive: true });
+    writeFileSync(path.join(pluginDir, "package.json"), JSON.stringify({ name: "@acme/example" }));
+    writeFileSync(path.join(pluginDir, "dist", "manifest.js"), "export default {};\n");
+    writeFileSync(path.join(pluginDir, "dist", "nested", "chunk.js"), "export default {};\n");
+
+    const targets = resolvePluginWatchTargets(pluginDir);
+
+    expect(targets).toEqual([
+      { path: path.join(pluginDir, "package.json"), recursive: false, kind: "file" },
+      { path: path.join(pluginDir, "dist", "manifest.js"), recursive: false, kind: "file" },
+      { path: path.join(pluginDir, "dist", "nested", "chunk.js"), recursive: false, kind: "file" },
+    ]);
+  });
+});

server/src/__tests__/plugin-worker-manager.test.ts

@@ -0,0 +1,43 @@
+import { describe, expect, it } from "vitest";
+import { appendStderrExcerpt, formatWorkerFailureMessage } from "../services/plugin-worker-manager.js";
+
+describe("plugin-worker-manager stderr failure context", () => {
+  it("appends worker stderr context to failure messages", () => {
+    expect(
+      formatWorkerFailureMessage(
+        "Worker process exited (code=1, signal=null)",
+        "TypeError: Unknown file extension \".ts\"",
+      ),
+    ).toBe(
+      "Worker process exited (code=1, signal=null)\n\nWorker stderr:\nTypeError: Unknown file extension \".ts\"",
+    );
+  });
+
+  it("does not duplicate stderr that is already present", () => {
+    const message = [
+      "Worker process exited (code=1, signal=null)",
+      "",
+      "Worker stderr:",
+      "TypeError: Unknown file extension \".ts\"",
+    ].join("\n");
+
+    expect(
+      formatWorkerFailureMessage(message, "TypeError: Unknown file extension \".ts\""),
+    ).toBe(message);
+  });
+
+  it("keeps only the latest stderr excerpt", () => {
+    let excerpt = "";
+    excerpt = appendStderrExcerpt(excerpt, "first line");
+    excerpt = appendStderrExcerpt(excerpt, "second line");
+
+    expect(excerpt).toContain("first line");
+    expect(excerpt).toContain("second line");
+
+    excerpt = appendStderrExcerpt(excerpt, "x".repeat(9_000));
+
+    expect(excerpt).not.toContain("first line");
+    expect(excerpt).not.toContain("second line");
+    expect(excerpt.length).toBeLessThanOrEqual(8_000);
+  });
+});