examples: anime library sorter + pure-Lua Anitomy parser

Add a worked nautd scripting example that files each anime episode into a
media-server-friendly library the moment its file finishes verifying:

    <SORTED_ROOT>/<Title>/Season NN/<Title> - SNNENN.<ext>

- examples/anitomy.lua: a compact, dependency-free reimplementation of Anitomy
  (title/season/episode/release-group/resolution/year) in pure Lua — no
  require/io/os, so it embeds in the sandbox.
- examples/anime_sort.lua: on_file_complete hook that parses the filename and
  calls naut.move_file(); the embedded parser is a verbatim copy of anitomy.lua.
- examples/test_anitomy.lua, test_anime_sort.lua: parser battery + end-to-end
  path-building test with an embedded-vs-module drift guard. Wired into ctest as
  example_anitomy / example_anime_sort when a lua interpreter is present.
- docs: examples/README.md plus pointers from README and docs/scripting.md.

Verified end to end against a live nautd: file_complete -> move_file -> on-disk
relocate into the sorted tree.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/scripting.md

@@ -247,6 +247,14 @@ nautctl --socket /tmp/nautd.sock emit \
 
 ## 9. Complete example
 
+A full, tested real-world script lives in
+[`../examples/anime_sort.lua`](../examples/anime_sort.lua): it parses each
+finished file with an embedded Anitomy-style parser and sorts anime into a
+`Title/Season NN/Title - SNNENN.ext` library as episodes complete. See
+[`../examples/README.md`](../examples/README.md).
+
+A minimal version:
+
 ```lua
 -- archive-on-finish.lua
 -- Move each file to /archive as it completes, and log torrent completion.