chore(release): smart-data-engine-sdk 0.1.1, the index recovery fix

[krzysztof-smartdataengines]

Summary

This sets smart-data-engine-sdk 0.1.1, a patch release of the Python library alone, for
#100. Merging releases nothing. The owner approved the release; it happens by tagging this PR's
squash commit python-v0.1.1 and approving the PyPI deployment.

What 0.1.1 contains

• The fix from fix(operator): index recovery waits for the interrupted PostgreSQL statement #100. Resume and abandonment of a PostgreSQL in-place index build wait for the
  interrupted statement before reading the catalogue. Before, they raced its commit ("tuple
  concurrently updated") or dropped the index it was finishing.
• Nothing else in what the wheel ships. Since python-v0.1.0, git diff over python/src,
  python/pyproject.toml and python/README.md shows the fix in _index_build.py and the
  version, and nothing more.

Why npm gets no 0.1.1

Since typescript-v0.1.0, the only change in what the npm package ships (dist, bin, the
README, LICENSE and NOTICE) is its version field. One tag per language keeps an otherwise
identical package from going out under a new number (docs/publishing.md §5.1). npm keeps
0.1.0, and typescript/package.json stays on 0.1.1-dev.0.

What changed here

• python/src/sde/__init__.py: 0.1.1.
• CHANGELOG.md: the Unreleased section becomes the 0.1.1 section.

The documents that describe registry state change after the publish, as §5.5 step 6 says. main
then moves to 0.1.2.dev0.

What the tag will do

tools/release_tag.py accepts refs/tags/python-v0.1.1 on this tree. The release workflow builds
the wheel and sdist, the gate checks them, and after the deployment is approved it publishes them to
PyPI through trusted publishing.

Tests

• make check with both live engines on 4731381 (this head):
  • ruff and mypy are clean;
  • Python: 2103 passed and 10 skipped (the orderbook slice);
  • TypeScript: 999 of 999.
• CI: fourteen of fourteen.
• tools/release_tag.py on this tree resolves refs/tags/python-v0.1.1 to ('python', '0.1.1').
  As a control, it refuses typescript-v0.1.1, because the manifest says 0.1.1-dev.0.

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