fix(core): job failure semantics, stale-lock reaper, run-scoped context, reload

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

packages/core/test/registry.test.ts

@@ -1,4 +1,6 @@
 import { expect, spyOn, test } from "bun:test";
+import { mkdtemp, mkdir, rm, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { loadPlugins } from "../src/registry.ts";
 
@@ -22,3 +24,21 @@ test("duplicate ids across dirs keep the first", async () => {
   expect(reg.list()).toHaveLength(1);
   warn.mockRestore();
 });
+
+test("reload picks up an edited entry file", async () => {
+  const root = await mkdtemp(join(tmpdir(), "sttracker-plugins-"));
+  try {
+    await mkdir(join(root, "hot"));
+    const write = (v: string) =>
+      writeFile(join(root, "hot", "index.ts"), `export default { manifest: { id: "hot", name: "Hot", version: "${v}", sdkVersion: 1, mediaTypes: [], capabilities: [], config: [] } };\n`);
+    await write("1.0.0");
+    const reg = await loadPlugins([root]);
+    expect(reg.get("hot")?.manifest.version).toBe("1.0.0");
+    await new Promise((r) => setTimeout(r, 5));
+    await write("2.0.0");
+    await reg.reload();
+    expect(reg.get("hot")?.manifest.version).toBe("2.0.0");
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});