Follow-up to #124 (merged): the auto-patch pipeline required a separate write-scoped `REPO_RW_TOKEN` to push the branch. Reuse the existing `FORGEJO_TOKEN` instead.
- `propose-patches.R --open-pr` now pushes `auto/registry-patch-proposals` over HTTPS with `FORGEJO_TOKEN` (the same token used for the PR API); the read-only `origin` clone URL can't push, so it builds an authenticated URL explicitly.
- Drop `REPO_RW_TOKEN` from `.crow/auto-apply-patches.yaml` and the docs.
No new secret needed: the pipeline's secrets are now `PGPASS`, `REPO_RO_TOKEN`, and `FORGEJO_TOKEN` (all existing). `FORGEJO_TOKEN` must have repository write scope for the push to succeed.
105 tests pass; all pre-commit hooks pass.
Reviewed-on: #125
pat-s
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