feat(plugins): add episode-tags and auto-jimaku example plugins

- episode-tags: tag mined cards with show/episode parsed from the file name or stream title
- auto-jimaku: open Jimaku search when a file starts without a Japanese subtitle track
- Hold card-mined for notes merged into a note still waiting on queued YouTube media
- Route YouTube media settle reports through reportCardsReady
- Document both plugins in docs-site and changelog fragment

assets/plugins/auto-jimaku/plugin.json

@@ -0,0 +1,5 @@
+{
+  "name": "Auto Jimaku",
+  "version": "1.0.0",
+  "main": "main.js"
+}