ci: commit missing release-please-config.json

[petercorke]

Summary

• `.github/workflows/release-please.yml` requires `release-please-config.json` (`config-file:` input), but it was never actually committed to the repo -- only ever present as an untracked local file. Confirmed the automated release pipeline has been silently non-functional the entire time: zero release-please bot PRs have ever run, despite 39 merged PRs (including real `feat:` commits) since the last tag, `v2.0.1`.
• Already flagged as a sub-point in tech-debt issue Repo root is full of untracked scratch/junk files #45 ("worth checking before cleanup, not after") -- this addresses that specific sub-point (the rest of Repo root is full of untracked scratch/junk files #45, the untracked scratch/junk files, is unrelated and still open).
• Content is unchanged from the untracked working-tree copy: `release-type: python`, `version-file: pyproject.toml`, `changelog-path: CHANGELOG.md`, matching the existing (already-tracked) `.release-please-manifest.json` (`"." : "2.0.1"`).
• Merging this (a push to `main`) should itself trigger `release-please.yml` to run for the first time successfully, which should open its own auto-generated release PR for the next version.

Related to #45 (does not close it -- the untracked-scratch-files part of that issue is still open)

Test plan

• Merge and confirm release-please's own workflow run succeeds and opens a release PR

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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