Add design doc for extracting sans-I/O pattern into reusable crate#33
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RobbieMcKinstry merged 4 commits intotrunkfrom Feb 8, 2026
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Analyzes what it would take to extract the generalizable "Functional Core, Imperative Shell" architecture from crates/controlplane into a standalone kube-sans-io crate. Covers generic ReconcileResult<U,S>, Snapshot trait, executor traits, migration phases, and design decisions. https://claude.ai/code/session_01DSEmZoHqrhsQUZwzU2SHoR
Major changes: - Executor trait uses #[async_trait] for object safety, enabling dyn Executor for test fakes (RecordingExecutor, FailingExecutor) - Single Executor trait with associated types replaces three separate traits - Ships built-in test fakes in kube_sans_io::testing module - ControllerContext holds Box<dyn Executor<...>> for dependency injection - Replace chrono with jiff::Timestamp for datetime operations - Add testing layer summary showing what's fakeable at each level https://claude.ai/code/session_01DSEmZoHqrhsQUZwzU2SHoR
Parent issue + 4 sub-issues (one per migration phase) with detailed acceptance criteria including linting, formatting, and test requirements. https://claude.ai/code/session_01DSEmZoHqrhsQUZwzU2SHoR
Each sub-issue now has a "Blocked by" field showing which phase must complete first. Added a visual dependency graph at the top for quick reference. All four phases are strictly sequential. https://claude.ai/code/session_01DSEmZoHqrhsQUZwzU2SHoR
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Analyzes what it would take to extract the generalizable "Functional Core,
Imperative Shell" architecture from crates/controlplane into a standalone
kube-sans-io crate. Covers generic ReconcileResult<U,S>, Snapshot trait,
executor traits, migration phases, and design decisions.
https://claude.ai/code/session_01DSEmZoHqrhsQUZwzU2SHoR