polyc-controller 2026.9.0

Conversation CRD + kube reconciler for the polychrome control plane.
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polychrome control-plane reconciler.

Defines the [Conversation] custom resource (polychrome.dev/v1alpha1) and the kube controller that reconciles each Conversation into one agent-sandbox SandboxClaim (and thus one isolated harness pod).

The reconcile decision is the pure [reconcile::plan] function; the kube IO that applies it is [reconcile::reconcile]. See the module for the lifecycle (finalizer → claim creation → status → cleanup).