Add HA lifecycle tests and CI

ROADMAP.md

@@ -40,7 +40,7 @@ Current behavior: **shadow mode only**. `generic_thermostat` remains the one and
 **Objective:** Make the existing observer trustworthy before extending it.
 
 - [x] Perform a source audit of v0.2.1: pure model, optimizer, config/options, coordinator update timing, persistent model and entity lifecycle.
-- [ ] Add Home Assistant test harness coverage for initial setup, update, restart/reload, options changes, missing sensors, `heat/off`, target changes, teardown and uninstall.
+- [x] Add Home Assistant test harness coverage for initial setup, update, restart/reload, options changes, missing sensors, `heat/off`, target changes, teardown and uninstall.
 - [ ] Verify that **zero physical-device service calls** occur in observation mode, including restart and failed update cases.
 - [ ] Establish deterministic handling of 5-minute transitions, polling jitter, timestamp discontinuities, missing data and real switch transitions between samples.
 - [x] Add input freshness thresholds and diagnostics that identify exactly which source is missing/stale/invalid.
@@ -57,14 +57,17 @@ Current behavior: **shadow mode only**. `generic_thermostat` remains the one and
 See [AUDIT.md](AUDIT.md). The source audit and focused repairs are complete;
 Milestone 0 acceptance is **not** complete. Offline boundary doubles cover setup,
 reload/unload, migration, removal, corrupt storage, missing inputs and manual off.
-They are not a full HA test harness. Per-room accepted ON/OFF counts, additive
+A follow-up now adds 14 real HA Core 2025.12.0 tests on Python 3.13, including
+config/options flows, scheduling, registry cleanup and Store API calls. Disk I/O
+and source entities are mocked; HAOS and full-process restart tests remain open. Per-room accepted ON/OFF counts, additive
 payload schema v2, conservative relay-transition rejection, jitter normalization,
 Fahrenheit targets and forecast input-change guards are implemented.
 
 Configurable room/weather report-age limits and per-source quality diagnostics
 are now implemented with offline coverage. Sensor alignment remains open.
-Next implement a supported HA test harness/CI. Then improve event-based sampling and identity/persistence
-migration tests. Only after those reliability checks proceed to Milestone 1's
+The HA Core harness and Forgejo/Gitea workflow are now added and pass locally;
+remote runner execution remains unverified. Next improve event-based sampling and
+identity/persistence migration tests, then extend the HA version matrix. Only after those reliability checks proceed to Milestone 1's
 recorded forecasts and walk-forward evaluation. Live control remains unauthorized.
 
 ## Milestone 1 — Explainable forecasts and dashboards (target v0.3.0)