docs: add changelog for v0.1.0 and v0.2.0

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project are documented here.
+The format follows [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]
+
+## [0.2.0] — 2026-05-20
+
+### Added
+- **Docker support.** `Dockerfile` (python:3.12-slim, non-root user, Streamlit
+  healthcheck) and `docker-compose.yml` for one-command Linux deploys.
+  Configurable `HOST_PORT`, optional CA-bundle volume for self-signed GUIs.
+- **Bash launcher.** `run.sh` for native (non-Docker) Linux runs. Creates a
+  `.venv` on first use and launches either the Streamlit UI (default) or the
+  REPL. Honours `HOST` and `PORT` env vars.
+- **Cross-platform line endings.** `.gitattributes` pins LF on shell scripts,
+  YAML, Python and Markdown so checkouts on Linux from a Windows host don't
+  break the launcher with `^M` characters.
+- **`.dockerignore`** to keep the image lean.
+
+### Changed
+- **README rewritten** with Docker + Linux quick starts in front of the
+  Windows / PowerShell path.
+- `.env.example` now flags v3 as the current API and documents the GUI port
+  conventions (443 for CNSA / containerised, 46443 for native installs) plus
+  the Swagger UI location.
+
+## [0.1.0] — 2026-05-20
+
+Initial release.
+
+### Added
+- **Agentic chat over the GPFS REST API v3.** Anthropic Claude with native
+  tool-use; a single `gpfs_request` tool whose verb enum is narrowed by env
+  config so disallowed methods can't even be requested.
+- **Two front-ends.** Rich-styled terminal REPL (`python -m gpfs_agent`) and a
+  pure-Python Streamlit web UI (`gpfs_agent/web.py`). Shared
+  Agent/Dispatcher/Client stack.
+- **Env-driven guardrails.**
+  - Read-only by default; `GPFS_ALLOW_WRITES` enables `POST/PUT`;
+    `GPFS_ALLOW_DESTRUCTIVE` enables `DELETE`.
+  - `GPFS_CONFIRM_MUTATIONS` gates each mutating call at the human.
+  - Optional `GPFS_PATH_ALLOW` / `GPFS_PATH_DENY` regex on the request path.
+  - Free-text `GPFS_INSTRUCTIONS` / `GPFS_INSTRUCTIONS_FILE` appended to the
+    system prompt for site-specific rules.
+- **Curated `/scalemgmt/v3` endpoint reference** baked into the system prompt
+  (`gpfs_agent/endpoints.py`), compiled from IBM Storage Scale 5.2.3 / 6.0.0
+  docs. Covers cluster, nodes, NSDs, filesystems, filesets, snapshots,
+  quotas, policies, jobs and perfmon — plus async-job conventions and the
+  `:link` / `:unlink` / `:batchDelete` custom-verb syntax.
+- **TLS hardening knobs.** `GPFS_VERIFY_TLS` and `GPFS_CA_BUNDLE` for
+  self-signed lab gear.
+
+[Unreleased]: https://git.discworld.casa/laurence/gpfsagent/compare/v0.2.0...HEAD
+[0.2.0]: https://git.discworld.casa/laurence/gpfsagent/compare/v0.1.0...v0.2.0
+[0.1.0]: https://git.discworld.casa/laurence/gpfsagent/releases/tag/v0.1.0