Bump to 0.1.1 — validate new PyPI Trusted Publisher

[cigan1]

Summary

No-op release whose purpose is to exercise the new `siftfy/siftfy-python` PyPI Trusted Publisher end-to-end before we delete the old `GipsyChef/...` trusted-publisher row.

What this does

• Bumps `version` to `0.1.1` in both `src/siftfy/_version.py` and `pyproject.toml` so the workflow's tag-matches-package-version check passes.
• Side benefit: re-publishes the package's `[project.urls]` to PyPI with the canonical `siftfy/` URLs (which were canonicalized in Canonicalize URLs to siftfy/ org after repo transfer #3 but won't surface on the PyPI project page until a new release).

Release flow

1. Merge this PR.
2. `git tag v0.1.1` on `main` and push the tag.
3. The `Publish to PyPI` workflow runs, exchanges OIDC for a PyPI upload token via Trusted Publisher.
4. If the new trust is wired correctly: 0.1.1 lands on PyPI and we delete the `GipsyChef` row.
5. If trust fails: workflow fails the publish step. We leave both rows in place and debug.

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