Windows build links ole32; CI cross-builds Windows on main/develop; docs

- os.user_data_dir needs ole32.lib on Windows
- Build workflow gets a Windows cross-build job with a cached SDK
- Drop the backtick from Jua's codepoints (the font lacks it)
- Update AGENTS.md and README for decks, controls, scores and layout

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

README.md

@@ -2,6 +2,24 @@
 
 Odin + raylib memory card game for learning Japanese, Korean and Thai scripts.
 
+Match each symbol with its reading: hiragana and katakana with romaji, Hangul letters with their
+Revised Romanization, and Thai consonants with their sound and name word. Three difficulties
+(6, 12 or 16 pairs), best scores per deck, and a card deck themed on each country's flag.
+
+## Controls
+
+| | |
+|---|---|
+| Mouse | Click cards and buttons |
+| Arrows / WASD / hjkl | Move between cards |
+| Enter / Space | Flip the selected card (Enter also plays again) |
+| 1-3 | Pick a language or deck in menus |
+| Left / Right | Change difficulty |
+| Esc | Back (quits from the main menu) |
+
+Scores are saved to `profile.json` in the user data folder (`~/Library/Application Support/HanjaKanaMun`
+on macOS, `~/.local/share/HanjaKanaMun` on Linux, `%APPDATA%\HanjaKanaMun` on Windows).
+
 ## Development
 
 Requires [Odin](https://odin-lang.org) (dev-2026-09) and [just](https://just.systems).
@@ -27,7 +45,8 @@ Formatting goes through ols (`vim.lsp.buf.format()`), or `just fmt` if `odinfmt`
 
 ## CI
 
-- `.gitea/workflows/gitea-build.yaml`: check, test and build on pushes and PRs to `main` and `develop`.
+- `.gitea/workflows/gitea-build.yaml`: check, test and build on pushes and PRs to `main` and `develop`, plus a
+  Windows cross-build so link problems show up before a release.
 - `.gitea/workflows/gitea-release.yaml`: on a version tag like `v1.0`, builds Linux and Windows packages, uploads them
   to the Gitea generic package registry (`HanjaKanaMun/1.0`) and creates a Gitea release with both attached.
   Needs a `TOKEN` secret with package write access.
@@ -37,4 +56,5 @@ Release: `git tag v1.0 && git push origin v1.0`
 
 ## Credits
 
-Font: M PLUS Rounded 1c, SIL Open Font License (`assets/MPLUSRounded1c-OFL.txt`).
+Fonts, all under the SIL Open Font License (license files in `assets/`):
+M PLUS Rounded 1c (UI and kana), Jua (Hangul), Mali (Thai).