docs(design): record the real content folder

docs/design/002-direction-round-notes.md

@@ -282,6 +282,28 @@ mockup of the transition.
     slim bar; when collapsed, A's strip appears in the panel; B's ribbons in the sea are an on/off
     switch ("Threads on the sea").
 
+### 17. Real content added outside the repo
+
+> "We have also added audio files, as well as a full version of Homer's Oddysey and Illiad to the
+> epic-the-musical-content directory in home."
+
+What is in `~/epic-the-musical-content/` (1.5 GB, checked 2026-10-30):
+- `Songs and Lyrics/EPIC - The <Saga> Saga (<year>)/`: all 9 sagas, **40 songs as FLAC**, **37 `.lrc`
+  timed-lyrics files** (3 songs have none), plus `album.nfo` (saga blurb, fandom-wiki credited) and
+  `folder.jpg` cover art. File names: `Jorge Rivera-Herrans - EPIC - The <Saga> Saga - NN - <Title>.flac|.lrc`.
+- `Homers the Odyssey Book/The Odyssey.txt` and `The Illiad.txt`: Project Gutenberg #1727 and #2199,
+  **Samuel Butler's prose translations** (public domain). Being prose, they have books and paragraphs,
+  not line numbers, so the sample data's "Book 9, lines 105–460" references will not map onto them.
+
+*(Claude's notes)*
+- The `.lrc` files make **synced lyrics** possible: the Listen & lyrics player can highlight the
+  current line, not just the current part.
+- The Odyssey text makes the "real place in the Odyssey" link able to open the actual passage.
+- The audio, lyrics and cover art are Jorge Rivera-Herrans' copyrighted work. AGENTS.md currently says
+  "lyrics are placeholders, never real lyrics". Proposed: keep this folder **out of git and out of the
+  Docker image**; the server reads it from a `CONTENT_DIR` path, mounted read-only into the container.
+  Needs the user's OK (it touches `src/server.ts`, the Dockerfile and the lyrics rule).
+
 ## Open questions (in priority order)
 
 1. ~~Which sea-chart approach (08–11) reads best, or which mix?~~ 11's navigation + 10's style (§9).