feat: initial public release (MAESTRO)

CHANGELOG.md

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+# Changelog
+
+All notable changes to MAESTRO are documented here. The format is loosely based
+on [Keep a Changelog](https://keepachangelog.com/), and the project aims to
+follow semantic versioning.
+
+## v0.1.0 — Initial public release (2026-06-02)
+
+First open-source release of MAESTRO, an agent orchestration platform:
+
+- Runs tasks against any OpenAI-compatible LLM endpoint (Ollama, vLLM, …).
+- LLM-classified task routing into **Pieces** (YAML workflows) of **movements**.
+- Sandboxed tool runtime (Read/Write/Edit/Bash/Glob/Grep, Office, Web, Browser,
+  Image, Data/SQLite, Knowledge/RAG, SSH, MCP, sub-tasks, and more).
+- Bash tool sandbox (bwrap-based filesystem/network/env isolation with a
+  hardened fallback) and a declarative pre-baked Python toolchain.
+- Optional LLM Gateway (virtual keys, budgets, metrics), reflection-based
+  learning, scheduled tasks, and a React web UI.
+- Apache-2.0 licensed.