Add Spa.load_detached_action, decorator identifier rule, npm updates

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

docs/CLAUDE.dist.md

@@ -1026,6 +1026,30 @@ Unhandled errors auto-show flash alert.
 
 ---
 
+## DATA FETCHING (CRITICAL)
+
+**DEFAULT**: Use `Model.fetch(id)` for all single-record retrieval from JavaScript.
+
+```javascript
+const user = await User_Model.fetch(1);         // Throws if not found
+const user = await User_Model.fetch_or_null(1); // Returns null if not found
+```
+
+Requires `#[Ajax_Endpoint_Model_Fetch]` on the model's `fetch()` method.
+
+Auto-populates enum properties and enables lazy relationship loading.
+
+**If model not available in JS bundle**: STOP and ask the developer. Bundles should include all models they need (`rsx/models` in include paths). Do not create workaround endpoints without approval.
+
+**Custom Ajax endpoints require developer approval** and are only for:
+- Aggregations, batch operations, or complex result sets
+- System/root-only models intentionally excluded from bundle
+- Queries beyond simple ID lookup
+
+Details: `php artisan rsx:man model_fetch`
+
+---
+
 ## BROWSER STORAGE
 
 **Rsx_Storage** - Scoped sessionStorage/localStorage with automatic fallback and quota management. All keys automatically scoped by session, user, site, and build. Gracefully handles unavailable storage and quota exceeded errors. Storage is volatile - use only for non-critical data (caching, UI state, transient messages).