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

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

plugins/mangabaka/src/api.ts

@@ -1,7 +1,6 @@
 import type { PluginContext } from "@sttracker/plugin-sdk/types";
 
 export const BASE_URL = "https://api.mangabaka.org";
-/** The host builds the HttpClient; it should use this rate for this plugin. */
 
 export interface ApiSource { id?: number | string | null }
 export interface ApiSeries {