fix(appv2): correction sauvegarde champs description HTML

- Remplacer les balises <prose-mirror> brutes par {{formInput}}
  pour les champs HTMLField (biographie, notes, description)
- Onglets passent en basculement CSS sans re-render
- Ajout de systemFields au contexte des feuilles d'acteur

AGENTS.md

@@ -0,0 +1,51 @@
+# BoL — FoundryVTT Game System
+
+FoundryVTT game system for Barbarians of Lemuria (French edition, Ludospherik). System id `bol`. Compatible Foundry v13–v14.
+
+## Commands
+
+| Command | Action |
+|---------|--------|
+| `npm run css` | Compile LESS → `css/bol.css` (one-shot) |
+| `npm run watch` / `npm start` | Watch `styles/**/*.less`, recompile on change |
+
+No test or lint scripts exist.
+
+## Entry Point & Architecture
+
+`module/bol.js` — wires everything in `Hooks.once('init', ...)` and `Hooks.once('ready', ...)`.
+
+| Path | Role |
+|------|------|
+| `module/bol.js` | System init, sheet/data model registration, socket setup |
+| `module/system/config.js` | `BOL` constants, `System.debugMode` flag |
+| `module/system/bol-utility.js` | Static helpers, settings (`bol` namespace), socket handler (`system.bol`) |
+| `module/controllers/bol-rolls.js` | All roll logic — `BoLRoll` static methods |
+| `module/models/` | DataModel classes (`.mjs`) for Actor/Item types |
+| `module/applications/sheets/` | **AppV2 sheets** (`ActorSheetV2`/`ItemSheetV2` + `HandlebarsApplicationMixin`) |
+| `styles/` | LESS sources → compiled to `css/bol.css` |
+| `templates/` | Handlebars `.hbs` partials |
+| `lang/` | `fr.json`, `en.json`, `de.json`, `es.json` |
+
+## Key Conventions
+
+- **AppV2 sheets** — base classes are `foundry.applications.sheets.ActorSheetV2` / `ItemSheetV2` mixed with `HandlebarsApplicationMixin`. Do NOT use `foundry.appv1.sheets.*`.
+- **`game.bol`** — system exposes `BoLActor`, `BoLItem`, `BoLRoll`, `BoLUtility`, `Macros`, `BOL` config, `models`, `sheets` on this namespace after init.
+- **i18n prefix** — all keys start with `BOL.`; use `game.i18n.localize("BOL.xxx")`.
+- **FR-first** — `fr.json` is most complete. EN compendium translation requires [Babele](https://gitlab.com/riccisi/foundryvtt-babele) module. A warning fires at startup if EN is selected without Babele.
+- **`System.debugMode = true`** in `module/system/config.js:8` — set to `false` before release.
+- **LESS only** — never edit `css/bol.css` directly. Edit `.less` files under `styles/`, recompile with `npm run css`.
+- **Data models** — `template.json` defines schema via `Actor.types` (character, encounter, horde, vehicle) and `Item.types` (item, feature). All data lives under `.system`.
+- **Sheet partials** — registered in `module/system/templates.js`. Add new partials there.
+- **Static classes** — `BoLRoll` and `BoLUtility` are purely static; never instantiate.
+- **`template.json.SAVED`** in root is the data model reference; the actual `template.json` may need regeneration.
+- **`package.json` and lockfile are in `.gitignore`** — npm is dev-only for LESS compilation. Not needed to run the system in Foundry.
+- **`{{formInput}}` for HTML fields** — always use `{{formInput fieldDef enriched=x value=y name="system.path" toggled=isEditable}}` for `HTMLField` in AppV2 sheets. Never use raw `<prose-mirror>` elements; they break form submission.
+- **Tab switching** — use CSS-only toggle (no `this.render()`) to preserve ProseMirror editor state. See `base-item-sheet.mjs` pattern.
+
+## CI & Release
+
+- CI triggers **only on release publish** (`.gitea/workflows/main.yml`).
+- Release zips: `system.json template.json README.md LICENSE assets/ compendiums/ css/ fonts/ images/ lang/ module/ packs/ styles/ templates/ ui/`.
+- Version/URL manifest/download are substituted in `system.json` during CI.
+- Published to Foundry package registry via `foundryvtt-publish-package-action`.