docs: Public roadmap v1

ROADMAP.md

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+# Inference-X Public Roadmap
+
+## Current (v1.x)
+
+- [x] Engine: 305KB, 19 backends, zero dependencies
+- [x] OpenAI-compatible API
+- [x] Free cloud demo (build.inference-x.com)
+- [x] Community model store (beta)
+- [x] Config builder + universal installer
+- [ ] Echo Relay: federated inference network (Q2 2026)
+- [ ] Organ Store: AI persona marketplace (Q2 2026)
+
+## Next (v2.x)
+
+- [ ] Scout network: community hardware map
+- [ ] Forge pipeline: open model quantization
+- [ ] Multi-model routing
+- [ ] Mobile binary (iOS/Android)
+- [ ] WASM port
+
+## Contributions Needed
+
+- Windows installer testing
+- macOS M1/M2/M3 benchmarks
+- ARM/Raspberry Pi documentation
+- Language bindings (Python, Rust, Go)
+- Craton-specific hardware guides
+
+## Propose a Feature
+
+Open an issue labeled roadmap-proposal.
+Your craton admin will review.