docs: add the changelog with the 0.1.0 release

CHANGELOG.md

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+# Changelog
+
+All notable changes to tiroir are recorded here. Set the date on a release's
+heading when tagging it.
+
+## [Unreleased]
+
+## [0.1.0] - 2026-10-29
+
+First release: the skeleton milestone, working from end to end on a VPS.
+
+- A store is a bare Git repository of Markdown drawers, validated against its
+  schema. `tiroir admin` creates one from a preset; the `accounting-firm`
+  preset ships with a synthetic dataset.
+- A server process with its SQLite database and a first administrator. Members
+  sign in, and the server acts as the OAuth authorization server for
+  connectors.
+- A member-scoped core API, and an MCP endpoint with the `tiroir_search`,
+  `tiroir_read`, `tiroir_write` (including `log`) and `tiroir_status` tools.
+- Keyword search over the stores, indexed with SQLite FTS5.
+- A container image for `linux/amd64` and `linux/arm64`, published on
+  `ghcr.io/ancelin-code/tiroir`, and a Compose stack behind Caddy with
+  automatic HTTPS.
+- An installation guide for a VPS and a guide to connect Claude Desktop. The
+  exit check ran on an Oracle Cloud ARM VPS and held.
+
+[Unreleased]: https://github.com/ancelin-code/tiroir/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/ancelin-code/tiroir/releases/tag/v0.1.0