Restore DC charger control compatibility (v1.2.7.1)

[TypQxQ]

Summary

• keep the write-only DC charger start/stop controls independent of optional running-state register 31513
• keep the deprecated DC charging switch available and off for a valid Idle state
• when 31513 is unavailable, use other responding DC telemetry for command availability and use output power as the deprecated switch's legacy state fallback
• restore DC controls that v1.2.7 previously marked hidden_by=integration
• bump the integration version to 1.2.7.1

Root cause

PR #398 in v1.2.7 added register_support_keys=("dc_charger_running_state",) to the deprecated DC switch and both DC command buttons. When a charger does not expose register 31513, the new unsupported-register lifecycle hides and unloads all three controls even though their command register is a separate write-only register. The deprecated switch's availability function also treated the valid Idle value (0x00) as unavailable instead of off.

An explicit empty dependency tuple now represents controls backed only by a write-only register and is treated as structurally supported. This allows registry entries hidden by v1.2.7 to be restored while preserving user-hidden entries. Runtime availability remains telemetry-based, unsupported-register filtering remains active for raw sensors and other entities, and missing Modbus data is not converted into a false Idle sensor value.

Validation

• parsed all 17 integration Python modules with ast.parse
• validated Idle, Occupied, Charging, Unavailable, missing-state/responding-telemetry, and no-telemetry behavior
• validated running-state preference and output-power fallback for the deprecated switch
• validated the three DC controls opt out of inferred readable-register filtering
• validated v1.2.7 integration-hidden registry entries are restored
• validated user-hidden registry entries remain unchanged
• validated ordinary raw-register True / False / None support behavior remains unchanged
• validated manifest.json version 1.2.7.1
• git diff --check

Addresses #403

[chatgpt-codex-connector]

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Reviewed commit: c6b889961e

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[greptile-apps]

Greptile Summary

This PR restores DC charger controls on devices that do not expose the optional running-state register and ensures integration-hidden controls return after upgrading.

• Treats explicit empty register dependencies as structurally supported.
• Uses responding DC telemetry for runtime command availability when running state is absent.
• Preserves Idle as an available, off state for the deprecated switch and falls back to output power for legacy state.
• Updates the integration version to 1.2.7.1.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains; the current support result is explicitly true for dependency-free controls, and both registry reconciliation paths can restore entries previously hidden by the integration.

Important Files Changed

Filename	Overview
custom_components/sigen/common.py	Distinguishes explicit empty register dependencies from inferred dependencies, returns structural support for dependency-free controls, and adds telemetry-based DC command availability.
custom_components/sigen/button.py	Marks both write-only DC charger command buttons as independent of the optional running-state register.
custom_components/sigen/switch.py	Restores the deprecated DC switch without register 31513, keeps Idle available as off, and adds the documented output-power fallback.
custom_components/sigen/manifest.json	Bumps the integration version from 1.2.7 to 1.2.7.1.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
    A[DC control description] --> B{Register dependencies}
    B -->|Explicit empty tuple| C[Structurally supported]
    C --> D[Restore integration-hidden registry entry]
    D --> E{Running-state register available?}
    E -->|Yes| F[Use running state]
    E -->|No| G[Use responding DC telemetry]
    F --> H[Determine runtime availability and switch state]
    G --> H

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[TypQxQ]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Breezy!

Reviewed commit: 74b37064e4

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