chore(release): final release commit for 0.1.0

this commit includes a whole lotta fuck yeah, a whole lotta we fuckin
got this, and a lot of "please change the future."

i hope it works.

Signed-off-by: Sienna Meridian Satterwhite <sienna@r3t.io>

CHANGELOG.md

@@ -0,0 +1,65 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.1.0] - 2026-02-06
+
+### Added
+
+#### Core Features
+- CRDT-based synchronization using OR-Sets, RGA, and Last-Write-Wins semantics
+- Peer-to-peer networking built on iroh with QUIC transport
+- Gossip-based message broadcasting for multi-peer coordination
+- Offline-first architecture with automatic reconciliation
+- SQLite-backed persistence with WAL mode
+- Cross-platform support for macOS desktop and iOS
+
+#### Demo Application
+- Replicated cube demo showcasing real-time collaboration
+- Multiple instance support for local testing
+- Apple Pencil input support on iPad
+- Real-time cursor and selection synchronization
+- Debug UI for inspecting internal state
+
+#### Infrastructure
+- Bevy 0.17 ECS integration
+- Zero-copy serialization with rkyv
+- Automated iOS build tooling via xtask
+- Comprehensive RFC documentation covering architecture decisions
+
+### Architecture
+
+- **Networking Layer**: CRDT sync protocol, entity mapping, vector clocks, session management
+- **Persistence Layer**: Three-tier system (in-memory → write buffer → SQLite)
+- **Engine Core**: Event loop, networking manager, peer discovery, game actions
+- **Platform Support**: iOS and desktop with platform-specific input handling
+
+### Documentation
+
+- RFC 0001: CRDT Synchronization Protocol
+- RFC 0002: Persistence Strategy
+- RFC 0003: Sync Abstraction
+- RFC 0004: Session Lifecycle
+- RFC 0005: Spatial Audio System
+- RFC 0006: Agent Simulation Architecture
+- iOS deployment guide
+- Estimation methodology documentation
+
+### Known Issues
+
+- API is unstable and subject to change
+- Limited documentation for public APIs
+- Performance optimizations still needed for large-scale collaboration
+- iOS builds require manual Xcode configuration
+
+### Notes
+
+This is an early development release (version 0.x.y). The API is unstable and breaking changes are expected. Not recommended for production use.
+
+[unreleased]: https://github.com/r3t-studios/marathon/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/r3t-studios/marathon/releases/tag/v0.1.0