docs: add ROADMAP.md

Document the project roadmap grouped by theme:
- Production Readiness (pluggable session storage, CRD lifecycle, delete flow)
- Feature Completeness (related resources, multi-provider, metadata propagation)
- Ecosystem Integration (kcp, multicluster-runtime, PlatformMesh)
- Documentation & Community (CNCF Sandbox #448)

Each item links to the tracking GitHub issue.

Signed-off-by: mjudeikis-bot <mjudeikis-bot@faros.sh>
Signed-off-by: Mangirdas Judeikis <mangirdas@judeikis.lt>
Co-authored-by: Mangirdas Judeikis <mangirdas@judeikis.lt>
Co-authored-by: Hex (AI) <hex@faros.sh>

Author: 3 people

ROADMAP.md

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+# kube-bind Roadmap
+
+This roadmap reflects the current direction of the kube-bind project.
+Items are grouped by theme, not strict release milestones.
+Track progress via [GitHub Issues](https://github.com/kube-bind/kube-bind/issues).
+
+## 🏗️ Production Readiness
+
+- **Pluggable session storage** — replace in-memory backend session storage with
+  an external/pluggable implementation, enabling replicas > 1 for HA deployments
+  ([#424](https://github.com/kube-bind/kube-bind/issues/424),
+  [#488](https://github.com/kube-bind/kube-bind/issues/488))
+- **CRD lifecycle / BoundSchema changes** — support schema evolution after initial
+  binding, including updates and versioning
+  ([#404](https://github.com/kube-bind/kube-bind/issues/404))
+- **Delete flow** — full lifecycle support for APIServiceExport deletion and
+  graceful unbinding
+  ([#352](https://github.com/kube-bind/kube-bind/issues/352))
+- **Backend production hardening** — address remaining gaps for production-grade
+  deployments ([#284](https://github.com/kube-bind/kube-bind/issues/284))
+
+## 🔌 Feature Completeness
+
+- **Related resources** — support binding of associated resources such as
+  ConfigMaps and Secrets alongside primary CRDs
+- **Multi-provider/consumer support** — allow a single consumer cluster to bind
+  the same CRD from multiple providers, and other multi-tenancy scenarios
+  ([#321](https://github.com/kube-bind/kube-bind/issues/321))
+- **Object metadata propagation** — propagate selected labels/annotations between
+  provider and consumer objects
+  ([#315](https://github.com/kube-bind/kube-bind/issues/315))
+- **Reduced konnector permissions** — tighten RBAC footprint of the konnector
+  agent in consumer clusters
+  ([#303](https://github.com/kube-bind/kube-bind/issues/303))
+- **UI-only binding flow** — allow service binding without CLI, purely via
+  browser/OIDC redirect flow
+  ([#406](https://github.com/kube-bind/kube-bind/issues/406))
+- **Dry-run support** — fix `--dry-run` in `bind apiservice`
+  ([#365](https://github.com/kube-bind/kube-bind/issues/365))
+
+## 🌐 Ecosystem Integration
+
+- **kcp integration** — make the konnector kcp-aware and support serving from
+  APIBindings ([#317](https://github.com/kube-bind/kube-bind/issues/317),
+  [#300](https://github.com/kube-bind/kube-bind/issues/300),
+  [#323](https://github.com/kube-bind/kube-bind/issues/323))
+- **multicluster-runtime refactor** — refactor the konnector to use
+  [multicluster-runtime](https://github.com/kubernetes-sigs/multicluster-runtime)
+  for improved multi-cluster controller patterns
+  ([#299](https://github.com/kube-bind/kube-bind/issues/299))
+- **PlatformMesh integration** — provider-side integration with PlatformMesh
+  ([#447](https://github.com/kube-bind/kube-bind/issues/447))
+
+## 📖 Documentation & Community
+
+- Blog post on external integrations
+  ([#452](https://github.com/kube-bind/kube-bind/issues/452))
+- CNCF Sandbox application
+  ([#448](https://github.com/kube-bind/kube-bind/issues/448))
+- Adopters file
+
+---
+
+This roadmap is maintained by the [kube-bind maintainers](./MAINTAINERS.md).
+Contributions and feedback welcome via
+[GitHub Discussions](https://github.com/kube-bind/kube-bind/discussions) or
+[`#kube-bind`](https://kubernetes.slack.com/archives/C046PRXNJ4W) on Kubernetes Slack.