chore: migrate GRACE-Poly anchors to hierarchical dotted naming

Systematic rename of all semantic anchors (#region, [DEF], @RELATION)
across 1400+ files — backend Python, frontend Svelte/TS, specs, docs:
- Flat anchors become Namespace.Module.Entity
- @RELATION references updated to match new anchor paths
- Zero business logic changes

.specify/templates/ux-reference-template.md

@@ -1,4 +1,4 @@
-#region UxReference [C:3] [TYPE ADR] [SEMANTICS ux, reference, [DOMAIN]]
+#region Std.Specify.UxReference [C:3] [TYPE ADR] [SEMANTICS ux, reference, [DOMAIN]]
 @BRIEF UX interaction reference — persona, flows, states, and recovery paths. Drives `@UX_*` contract tags in Phase 1.
 
 **Feature Branch**: `[###-feature-name]`
@@ -75,4 +75,4 @@ $ command --flag value
 *   **Style**: [e.g. Concise, Technical, Friendly, Verbose]
 *   **Terminology**: [e.g. Use "Repository" not "Repo", "Directory" not "Folder"]
 
-#endregion UxReference
+#endregion Std.Specify.UxReference