Add energy-flow device feature constants (production power, grid-sensor, home-output-sensor)

[Terdious]

Mirrors GladysAssistant/Gladys#2693 in the SDK constants so external integrations can expose the full energy-flow telemetry:

• DEVICE_FEATURE_TYPES.ENERGY_PRODUCTION_SENSOR.POWER ('power') — instantaneous production power in watt (live solar/production power);
• new grid-sensor category — input-power, output-power, signed power, input-index, output-index (the device's own grid exchange);
• new home-output-sensor category — power, index, off-grid-power, off-grid-index (power delivered to the home / backup output).

Added in lib/device-constants.js and index.d.ts, with test coverage.

Claude-Session: https://claude.ai/code/session_012157sX3FKhVYmndWLJdhfo

Summary by CodeRabbit

• New Features

  • Added support for grid sensor features, including imported/exported power and energy indexes.
  • Added home output sensor features, including delivered power, energy indexes, and off-grid measurements.
  • Expanded energy production sensor feature mappings.

• Tests

  • Added coverage validating the new energy-related categories and feature types.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds grid and home-output sensor categories and feature types to runtime constants and TypeScript declarations, expands energy production types, and verifies the canonical string mappings with tests.

Changes

Energy feature constants

Layer / File(s)	Summary
Add energy sensor constants and coverage lib/device-constants.js, index.d.ts, test/device-constants.test.js	Adds grid and home-output sensor categories and feature types, expands energy production types, updates declarations, and tests canonical values.

Estimated code review effort: 2 (Simple) | ~5 minutes

Suggested reviewers: pierre-gilles

Poem

A rabbit hops through grids of light,
With power keys arranged just right.
New sensors bloom, types neatly flow,
Tests check each string in a row.
“Energy maps!” the bunny sings.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the added energy-related device feature constants and the new grid/home output sensor types.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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