chore(release): prepare v0.5.1

[anaselmhamdi]

Patch release for #86. 0.5.0 ships a CLI that cannot start without the bigquery extra, so this should go out promptly.

• CHANGELOG.md — new ## [0.5.1] - 2026-08-06 under ### Fixed
• pyproject.toml + uv.lock — 0.5.0 → 0.5.1

Patch rather than minor: no API change, no new behaviour, just a broken import path made lazy.

Checked before committing

• Release notes extract correctly — ran the exact awk from publish.yml: 804 bytes, no bleed into the 0.5.0 section. Without this the workflow silently falls back to a bare "Release 0.5.1" body.
• uv build succeeds → bizon-0.5.1.tar.gz + bizon-0.5.1-py3-none-any.whl.
• The artifact actually contains the fix — unzipped the wheel and confirmed the google import sits inside resolve_default_table_id with nothing at module level.
• The bug is genuinely gone from the release artifact — installed that exact wheel into a fresh venv with no extras (confirming google.cloud.bigquery absent) and ran bizon --help successfully. This is the check that would have caught the problem before 0.5.0 went out.

After merge

git tag v0.5.1 && git push origin v0.5.1 → build → PyPI → GitHub Release. Irreversible, so I'll leave the tag to you unless you'd rather I push it.

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