Add the Italian playtest edition (7.2.0, D53)

RULES.it.md translates RULES.md v0.9. edition/build.py renders a
printable A4 HTML (edition/it/playtest.html): quick reference, rules,
belt track, board overview and four board tiles drawn from the board
model (Tunnel pairs numbered, Dojo entrances marked), and the 22 Nebbia
cards. Adds markdown as a dev dependency.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

README.md

@@ -6,6 +6,7 @@ balance it.
 | Document | What it is |
 |---|---|
 | [`RULES.md`](RULES.md) | The rulebook (English working draft). |
+| [`RULES.it.md`](RULES.it.md) | Italian rulebook (playtest edition). |
 | [`board/FORMAT.md`](board/FORMAT.md) | How the board is written as text. |
 | [`agents/plans/`](agents/plans/) | Active work plan: decisions, phases, open questions. |
 
@@ -53,6 +54,20 @@ uv run dojo sim --seed 42 --jobs 1                # other dice; single process
 
 Minutes are estimated as 45 s per turn plus 30 s per Kumite.
 
+## Italian playtest edition
+
+`edition/build.py` builds `edition/it/playtest.html`: quick reference, full rules, belt track,
+the board (one A4 overview and four A4 tiles to cut and join), and the 22 Nebbia cards to cut
+out. Open it in a browser and print on A4 at 100% scale (no "fit to page"), with background
+graphics on.
+
+```sh
+uv run python edition/build.py
+```
+
+Sources: `RULES.it.md`, `edition/it/riepilogo.md` (quick reference), `edition/it/carte.toml`
+(card texts), `edition/it/style.css`, and the board files. Never edit the HTML by hand.
+
 ## Development
 
 ```sh