feat: capture and persist the full ErrorCode proto

[kingchddg901]

Summary

The novel MQTT parser decodes the ErrorCode protobuf but only ever read warn[0]. It never read the error[] array, the event timestamp, new_code, obstacle reminders, or battery-swap events — all of which arrive on the error frame and were discarded. This PR captures the whole proto and persists a rolling per-device history that survives restarts.

Motivation

On some devices (verified on an Omni/X-series unit), operational faults are reported through error[], not warn[]. Because the parser never read error[], error_message stayed permanently empty for those faults. Concretely: lifting the robot reports code 7002 ("MACHINE PICKED UP") in error[], which the current parser resolves to error_code = 0 and an empty message — so the fault is invisible.

Changes

• Parsers — the novel parser now decodes error[], warn[], last_time, new_code.{error,warn}, battery.restored, and obstacle_reminder[] (type / photo_id / accuracy / map_id / point). The primary error_code prefers a real error[] over a warn[]. The scalar and legacy parsers mirror error_codes[] so state shape is uniform across transports.
• State — VacuumState gains error_codes, warn_codes, last_error_time, new_error_codes, new_warn_codes, battery_restored, obstacle_reminders, and error_log. All additive with empty defaults; no breaking changes.
• Coordinator — a per-device Store (separate from the maps store) keeps the last 50 events, newest-first, loaded on startup. "Freshness" is judged from the per-update delta, not carried-forward state, so an ongoing fault is logged once rather than every tick; a clear→fault transition is a backstop for transports without new_code.
• Sensor — the Error Message sensor exposes the mined fields plus the full history as attributes.

Testing

Added unit tests: full-proto capture, error[]-over-warn[] priority, clear-to-empty, dedup of an ongoing fault, the legacy transition backstop, obstacle/battery logging, and the history cap. Full suite: 546 passing. pre-commit (pyupgrade / codespell / flake8 / isort / mypy / pylint) clean.

Live validation

On real hardware: lift → 7002 in error_codes[]; pulling the station tanks → 6010 / 6025 in warn_codes[]; all persisted with timestamps and resolved labels.

Notes

• The manifest.json version is intentionally left unchanged — release_version_check runs only on release tags, so the version bump is a maintainer/release step.