1.3.1rc3 — connected-stream validation

RC3 includes RC2 and stops publishing cached charger power when the burst
response does not explicitly report con:1. Disconnected or unverified streams
are unavailable; a connected stream reporting zero still publishes 0 W.
No entity identifiers or battery control behavior change.

Validation

• 135 standalone regression tests pass.
• Home Assistant 2026.9.2 lifecycle smoke passes with 15 simulated stations,
  including late discovery, station failure, reauthentication and unload.
• A bounded read-only probe with the patched API client returned connected hybrid
  telemetry with a 10-second server delay. No device command was issued.
• RC2's original hardware validation is now complete for the reported charger:
  issue #64 confirms disconnected, connected-idle and charging comparisons.
  Issue #39 confirms PV channels on HMS-800-2WB and HMS-1600-4WB.

Triage and stable promotion

Issue #72 does not identify an exact installed version. The reported top-level
pv2:0 cannot gate RC2/RC3's fallback: it uses the separate PV indicator feed and
single-microinverter rule.port. A regression test covers this distinction.
Hardware diagnostics from the exact candidate are still needed to determine why
that HMS-1000-2WB installation has no second channel. No fix for #72 is claimed.

Issue #71 likewise lacks an exact version and traceback. The 15-station smoke
passes, but simulated transport cannot establish installer-account permissions,
latency, or response shapes. No fix for #71 is claimed.

Keep this release a prerelease until these reports are classified and the
remaining hardware write/readback, long-running authentication and multi-account
restart validation is recorded. The connection guard is covered by deterministic
tests but has not been exercised through a real device disconnect in HA.

Installation and scope

Enable beta versions in HACS and select v1.3.1rc3, then restart Home Assistant.
Alternatively extract the attached archive into the HA configuration directory.
Preserve a configuration backup. The rollback/storage notes from RC1 still apply.
RC1 and RC2 are unchanged. Stable remains v1.3.0 until promotion is justified.

Fast PV polling (#69), consumer-specific endpoints and multi-device PV channel
mapping are not included. They belong to the separate 1.4.0 candidate.