chore: set up semantic versioning (Commitizen + CHANGELOG); bump 0.1.0 -> 0.2.0

Establishes the release process for the upcoming nutrition/wellness features (a
minor bump). Source of truth is pyproject [project].version; `uvx cz bump` derives
future versions from conventional commits and tags vX.Y.Z.

CHANGELOG.md

@@ -0,0 +1,30 @@
+# Changelog
+
+All notable changes to this project are 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). While the
+project is pre-1.0, new features bump the **minor** version and fixes bump the **patch**
+version. Versions are cut with Commitizen (`uvx --from commitizen cz bump`), which updates
+this file and tags `vX.Y.Z`.
+
+## [0.2.0] — unreleased
+
+### Added
+- Nutrition & wellness intelligence tooling (in progress on this branch): training-readiness
+  signal (HRV/RHR/sleep/subjective synthesis), pre-activity fueling planner (carbs/fluid/
+  sodium), energy-availability / underfueling screen, and a wellness/nutrition write path
+  (`PUT /athlete/{id}/wellness/{date}`).
+- Computed **Form (TSB = CTL − ATL)** surfaced in wellness output.
+
+### Fixed
+- Wellness output mislabeled the record `id` as the date.
+
+## [0.1.0] — 2026-07-20
+
+Baseline: multi-tenant fork of `intervals-mcp-server`. Per-user OAuth credentials with
+AES-256-GCM-encrypted Intervals.icu API keys (Better Auth), streamable-HTTP transport with
+CORS, and the full activity / event / wellness / power-curve / gear / custom-item toolset.
+
+[0.2.0]: https://git.farh.net/farhoodlabs/intervalsicu-mcp/compare/v0.1.0...HEAD
+[0.1.0]: https://git.farh.net/farhoodlabs/intervalsicu-mcp/releases/tag/v0.1.0

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "intervalsicu-mcp"
-version = "0.1.0"
+version = "0.2.0"
 description = "A Model Context Protocol server for Intervals.icu (FastMCP, native OAuth)"
 readme = { file = "README.md", content-type = "text/markdown" }
 requires-python = ">=3.12"
@@ -124,3 +124,14 @@ asyncio_default_fixture_loop_scope = "function"
 
 [tool.uv]
 index-url = "https://pypi.org/simple"
+
+# Semantic versioning via Commitizen (conventional commits). Source of truth is the
+# [project].version above. Bump + changelog + tag with:  uvx --from commitizen cz bump
+# (feat -> minor, fix -> patch; pre-1.0 so breaking changes stay in 0.x). Tags are vX.Y.Z.
+[tool.commitizen]
+name = "cz_conventional_commits"
+version_provider = "pep621"
+tag_format = "v$version"
+major_version_zero = true
+update_changelog_on_bump = true
+changelog_file = "CHANGELOG.md"