Docs: multi-pattern presence, Sunday-first week and the migration-9 rollback (#233)

design/ENTITIES-AND-SERVICES.md

@@ -19,6 +19,14 @@ Planned surface from CTXD CONTEXT.MD, adjusted for the design decisions in
 | `sensor.nestquest_cycle_day` | int | 1d sub-line, 1f header |
 | *configured* `weather.<entity>` | HA core | panel dock |
 
+`present_today` is the child's **combined** presence across all of their presence patterns
+(a child has zero or more, each `home` or `away`) and overrides, first match wins: an
+override covering the date; else absent if any `away` pattern covers it; else present if
+any `home` pattern covers it; else absent when the child has at least one `home` pattern;
+else present. `cycle_day` is the 1-based day in the first patterned child's lowest-id
+pattern, from that pattern's anchor date (never ISO week numbers or parity); `0` when no
+child has a pattern.
+
 Per-instance data is too granular for entity state. The cards read the day's instance list
 from an attribute payload on the per-child sensor (or a websocket command —
 implementer's call), shaped:
@@ -45,12 +53,17 @@ implementer's call), shaped:
 | `nestquest.create_quest_definition` | **yes** | 1e `New` |
 | `nestquest.update_quest_definition` | **yes** | 1e sheet `Save changes` |
 | `nestquest.set_quest_definition_active` | **yes** | 1e row action |
-| `nestquest.set_presence_pattern` | **yes** | 1f presence card |
 | `nestquest.create_presence_override` | **yes** | 1i `Save override` |
 | `nestquest.delete_presence_override` | **yes** | 1f override row `trash-2` |
 | `nestquest.export_history_csv` | **yes** | 1g `CSV` |
 | `nestquest.manage_child` | **yes** | settings |
 
+Presence patterns have no HA service: the admin surface is the PWA (ARCHITECTURE §10),
+which manages a child's patterns through the admin API —
+`GET`/`POST /api/v1/admin/children/{child_id}/presence-patterns` to list and add, and
+`PATCH`/`DELETE /api/v1/admin/presence-patterns/{pattern_id}` to edit and delete one
+pattern (1f patterns card and pattern editor).
+
 `complete_quest` payload from the panel:
 
 ```yaml