docs: boost via economy temperature as the first command

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/roadmap.md

@@ -23,7 +23,7 @@ No behaviour change.
 - [x] C1 Gateway sharing: MK01 takes one client; our poll drops my parents' Frisko app.
 - [x] C2 Frisko app is used rarely (heating schedule overrides): keep 300 s polls until our UI
   replaces it, then the backend is the only client, with a "release gateway" switch for the app.
-- [ ] C5 Ask my parents exactly what they change for hot water, and whether they touch heating.
+- [x] C5 Parents raise the economy temperature (CWU 4143, CO 4131) to force heating; no tariff.
 - [ ] C3 Backup: read and store all editable parameters except the weekly program (read-only).
 - [ ] C4 No-op write: write the current value of 4131 back and read it, with me present.
 
@@ -34,7 +34,7 @@ No behaviour change.
 | M1 Reliable reading | Modbus worker and snapshot; config outside the jar; fix D1–D5; layers introduced as code is touched | A week on the Pi without manual action, Grafana unchanged |
 | M2 Understand the controller | Register map and timing (safe poll rate, response times) from Frisko code and read-only scans | `docs/frisko/` reviewed; F3 allowlist agreed |
 | M3 Read API and web UI | Status, history, health over HTTP; web UI; Traefik route and auth | Parents see live data on their phones |
-| M4 First command | One setting end to end with S1–S5, then the rest of the allowlist one by one | A setpoint changed from the phone, verified on the pump |
+| M4 First command | Boost (F3) for CWU, then CO, end to end with S1–S5 and automatic restore | Father boosts hot water from his phone, value restored on time |
 | M5 Alarms | F4 with notifications | Simulated alarm reaches the phone |
 | M6 Native app? | Decide: keep the web UI, WebView wrapper or React Native | Decision recorded |
 
@@ -63,6 +63,8 @@ Sources: [research/frisko/](../research/frisko/README.md).
   read or write the intervals. Reading the schedule is therefore not read-only, and the selector
   is shared with the panel and the Frisko app. Party mode (4140 = 2, hours in 4142) is a simpler
   "heat now" override.
+- Setpoints read 2026-10-23: CO eco/comfort 18/19 °C (4131/4132, range 5–35); CWU eco/comfort
+  8/43 °C (4143/4144, range 5–70); disinfection off (4145 = 0).
 - CWU today (Influx, 14 days): the pump heats it daily at ~11:00 and ~17:30 up to ~44 °C
   (~15–20 °C/h, pump outlet ~47 °C). Slow morning rises with the pump off come from solar.
 - Phone app: direct Modbus TCP, LAN only, 200–300 ms between requests, 5 s timeout.

docs/spec.md

@@ -57,8 +57,10 @@ Functional:
 
 - F1 Live status of all verified readings.
 - F2 History for the last 7 days.
-- F3 Change allowlisted settings. First and most important: heat hot water (CWU) earlier or later
-  than the weekly program (the only thing my parents use the Frisko app for).
+- F3 Change allowlisted settings. First and most important, **boost**: heat hot water (CWU) or
+  the house (CO) outside the weekly program. Today my father does it in the Frisko app by raising
+  the economy temperature (CWU 4143, CO 4131) and lowering it later. Our boost raises it for a
+  chosen time and restores the previous value automatically.
 - F4 Alarms shown in the app, with notification on a new alarm.
 - F5 Health of backend, controller link and tunnel.