Add fetch_cached() client-side ORM cache with SPA auto-reset

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

docs/CLAUDE.dist.md

@@ -826,6 +826,8 @@ const tasks = await project.tasks();    // hasMany → Model[]
 
 **fetch() is for SECURITY, not aliasing**: The `fetch()` method exists to remove private data users shouldn't see. NEVER alias enum properties (e.g., `type_label` instead of `type_id__label`) or format dates server-side. Use the full BEM-style names and format dates on client with `Rsx_Date`/`Rsx_Time`.
 
+**Cached Fetch**: `Model.fetch_cached(id)` — in-memory cache for non-critical display data (names, labels, log history). Cache stores promises so concurrent calls share one request. `fetch()` and `fetch_or_null()` warm the cache. Resets automatically on SPA navigation. Manual reset: `Rsx_Js_Model.orm_cache_reset()`, `Rsx_Js_Model.orm_cache_reset('Model_Name')`, `Rsx_Js_Model.orm_cache_reset('Model_Name', id)`. Do NOT use for data that must be fresh after edits.
+
 Details: `php artisan rsx:man model_fetch`
 
 ### Migrations