docs: add TODO.md

TODO.md

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+# TODO
+
+Items deferred for a future session.
+
+## Write-mode smoke tests
+
+`smoke_test.py --write` has not yet been validated against a live server.
+The read-only path is validated against Meridian 2024.3.0; write mode
+creates and deletes objects (events, categories, groups, requisitions, maps,
+etc.) and needs a dedicated dev or staging instance to run safely.
+
+- Run `python smoke_test.py --write --yes` against a non-production server
+- Fix any failures, then update the README/docs validation note from
+  "write mode untested live" to the confirmed version
+
+## Pre-commit config
+
+Add `.pre-commit-config.yaml` so contributors get ruff feedback before
+pushing:
+
+```yaml
+repos:
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.9.0   # pin to a recent release
+    hooks:
+      - id: ruff
+```
+
+Update `CONTRIBUTING.md` to mention `pre-commit install` as an optional
+setup step.
+
+## Development Status classifier
+
+`pyproject.toml` currently declares `Development Status :: 4 - Beta`.
+Consider upgrading to `5 - Production/Stable` once write-mode smoke tests
+pass against a live server.
+
+## OpenNMS Discourse announcement
+
+Post in the existing Python REST API thread on the OpenNMS community forum:
+<https://opennms.discourse.group/t/python-library-for-rest-api/1387>
+
+Include: PyPI install command, RTD docs link, brief feature summary.