Add protection domain foundation

docs/spec/08-current-product-backlog.md

@@ -12,6 +12,13 @@ requirements and intended sequencing, not proof of implementation.
 
 - [ ] Implement the agreed protected circuit-group and distribution-board
   component model in phased work packages.
+- [x] Phase A: central protection catalog, validation, defaults and pure grouped
+  BMK rules.
+- [ ] Phase B: persistence and snapshot/transfer compatibility model.
+- [ ] Phase C: persistent commands and new-board defaults.
+- [ ] Phase D: group numbering, moves and destructive operations.
+- [ ] Phase E: editor projection and editing.
+- [ ] Phase F: documentation and full GUI verification.
 - [ ] Keep full electrical sizing and cable-dimensioning rules separate until
   the planner supplies the calculation requirements.
 - Detailed specification:

docs/spec/09-distribution-board-components-and-protection-groups.md

@@ -519,12 +519,23 @@ specification supplied by the planner.
 
 ### A. Catalog and Pure Domain Rules
 
+Status: Complete.
+
 - introduce typed component roles, categories and protection-device types
 - centralize rating and characteristic catalogs
 - validate device-specific field combinations
 - define default circuit and group-RCD protection values
 - test numbering parsing and formatting independently from persistence
 
+Implemented foundation:
+
+- shared circuit-group categories, German labels and category numbers
+- one protection-device catalog with all agreed ratings and characteristics
+- strict device-dependent validation for fuse, LS, FI, FI/LS and AFDD fields
+- pure factories for circuit and group-RCD defaults
+- pure nested BMK formatting, parsing and highest-number-plus-one rules
+- no runtime database or editor integration before delivery phase B
+
 Acceptance:
 
 - every agreed valid combination is accepted