docs: Add README, VERSION, and CHANGELOG

CHANGELOG.md

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+# 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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [2.0.0] - 2026-02-09
+
+### Added
+- **Memory System** — Hybrid SQLite + ChromaDB storage for agent observations
+  - `/memory/save` — Save observations with automatic vector embedding
+  - `/memory/query` — Semantic search with progressive disclosure
+  - `/memory/get` — Fetch full observations by IDs
+  - `/memory/timeline` — Chronological context around specific time/observation
+  - `/memory/preference` — Store user preferences
+  - `/memory/stats` — Memory statistics per user
+- User isolation via `user_id` field (collections: `moxie_memory_{user_id}`)
+- Content deduplication via SHA256 hashing
+- Observation types: general, learning, decision, preference, tool_use, system_event
+
+### Changed
+- Updated Dockerfile to use PyTorch ROCm 7.2 nightly
+- Bumped version to 2.0.0
+
+## [1.0.0] - 2026-02-05
+
+### Added
+- Initial release
+- Multi-tenant RAG with ChromaDB vector storage
+- Document ingestion (PDF, DOCX, Excel, TXT, MD, CSV)
+- Semantic search via sentence-transformers
+- Audio/video transcription via Whisper API
+- Email pollers for auto-ingestion (zeus@zz11.net, moxie@zz11.net)
+- GPU acceleration with AMD ROCm