chore: release v0.7.0

[jacobsvante]

🤖 New release

• grid-tariffs: 0.6.0 -> 0.7.0 (⚠ API breaking changes)

⚠ grid-tariffs breaking changes

--- failure enum_variant_missing: pub enum variant removed or renamed ---

Description:
A publicly-visible enum has at least one variant that is no longer available under its prior name. It may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.43.0/src/lints/enum_variant_missing.ron

Failed in:
  variant TariffCalculationMethod::AverageDaysDifferentiated, previously in file /tmp/.tmpAJrs9q/grid-tariffs/src/power_tariffs.rs:67
  variant TariffCalculationMethod::PeakHours, previously in file /tmp/.tmpAJrs9q/grid-tariffs/src/power_tariffs.rs:72
  variant TariffCalculationMethod::AverageDayNightDifferentiated, previously in file /tmp/.tmpAJrs9q/grid-tariffs/src/power_tariffs.rs:75

--- failure inherent_method_missing: pub method removed or renamed ---

Description:
A publicly-visible method or associated fn is no longer available under its prior name. It may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.43.0/src/lints/inherent_method_missing.ron

Failed in:
  PowerTariff::get_peaks, previously in file /tmp/.tmpAJrs9q/grid-tariffs/src/power_tariffs.rs:151

Changelog

0.7.0 - 2025-10-27

Added

• Peak periods
• Simplifications of calculation methods
• made LoadType public
• CostPeriod.power_multiplier method

Fixed

• [breaking] Replace base load with low + high

Other

• Revert "fix!: Replace base load with low + high"

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This PR was generated with release-plz.