chore: release v0.2.0

[github-actions]

🤖 New release

• herdr-spreader: 0.1.1 -> 0.2.0 (⚠ API breaking changes)

⚠ herdr-spreader breaking changes

--- failure enum_struct_variant_field_added: pub enum struct variant field added ---

Description:
An enum's exhaustive struct variant has a new field, which has to be included when constructing or matching on this variant.
        ref: https://doc.rust-lang.org/reference/attributes/type_system.html#the-non_exhaustive-attribute
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.48.0/src/lints/enum_struct_variant_field_added.ron

Failed in:
  field dry_run of variant Command::Apply in /tmp/.tmpb2usZS/herdr-spreader/src/cli.rs:21

--- 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/v0.48.0/src/lints/enum_variant_missing.ron

Failed in:
  variant ConfigError::Parse, previously in file /tmp/.tmpSFjyGH/herdr-spreader/src/config.rs:94
  variant EngineError::WaitForWithoutCommand, previously in file /tmp/.tmpSFjyGH/herdr-spreader/src/engine.rs:73

--- failure function_missing: pub fn removed or renamed ---

Description:
A publicly-visible function cannot be imported by its prior path. A `pub use` may have been removed, or the function itself 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/v0.48.0/src/lints/function_missing.ron

Failed in:
  function herdr_spreader::config::load_config, previously in file /tmp/.tmpSFjyGH/herdr-spreader/src/config.rs:164
  function herdr_spreader::engine::apply_workspace, previously in file /tmp/.tmpSFjyGH/herdr-spreader/src/engine.rs:105

--- failure method_parameter_count_changed: pub method parameter count changed ---

Description:
A publicly-visible method now takes a different number of parameters, not counting the receiver (self) parameter.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#fn-change-arity
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.48.0/src/lints/method_parameter_count_changed.ron

Failed in:
  herdr_spreader::backend::cli::CliBackend::new takes 1 parameters in /tmp/.tmpSFjyGH/herdr-spreader/src/backend/cli.rs:237, but now takes 2 parameters in /tmp/.tmpb2usZS/herdr-spreader/src/backend/cli.rs:260

Changelog

0.2.0 - 2026-07-16

Added

• (cli) add --dry-run flag to print plan without executing
• (engine) introduce BackendOp/PaneHandle Data types and plan_workspace Calculation
• add validation checking phase and remove validate plugin

Other

• Document --dry-run flag in README
• Add functional programming guidelines with Actions/Calculations/Data principle
• (ARCHITECTURE) sync to refactored Actions/Calculations/Data architecture
• (integration) add plan-pinning tests for end-to-end plan verification
• (cli) thread HERDR_SOCKET_PATH into CliBackend; extract choose_focus_strategy
• (config) make path resolution immutable

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This PR was generated with release-plz.