Add running fitness history and configurable heart rate zones

AGENTS.md

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+# Completion and release workflow
+
+For every completed change in this repository, unless the user explicitly asks to
+keep it local or defer release:
+
+1. Finish the change and run the appropriate tests and checks.
+2. Review the diff, then commit the completed work and push it to `origin`.
+3. Deploy the pushed commit to the existing Dokku app `stride`, following
+   [docs/DEPLOYMENT.md](docs/DEPLOYMENT.md). Back up PostgreSQL before schema changes.
+4. Verify the deployed Git revision, successful migrations, web and worker health,
+   and the public HTTPS `/health` endpoint. Check the changed feature where feasible.
+5. Report the commit and deployment result. If release is blocked, state the exact
+   blocker and what has already completed; do not claim deployment succeeded.
+
+This is the user's standing authorization to commit, push and deploy completed
+changes. Preserve unrelated work and never commit secrets or database backups.