chore(release): v1.8.0

[makegov-mark]

Release v1.8.0.

Minor rather than patch: this ships the Federal Register documents resource, the alerts.federal_register.match event type, the agency filter on budget accounts, exclusions and IT Dashboard, and the organization expand on budget accounts, exclusions and SBIR resources (#68). All additive; no existing call changes meaning.

• pyproject.toml, tango/__init__.py and uv.lock bumped together.
• [Unreleased] graduated to ## [1.8.0] - 2026-09-28.

Verified

• uv build produces tango_python-1.8.0.tar.gz and tango_python-1.8.0-py3-none-any.whl.
• tango.__version__ reads 1.8.0.
• uv run ruff format --check tango/, uv run ruff check tango/ and uv run mypy tango/ pass (the same scope as lint.yml).
• uv run pytest tests/ -m "not integration": 430 passed.

Merging this does not publish

publish.yml triggers on release: [published] (or a manual dispatch), not on a push to main. Creating the v1.8.0 GitHub Release after merge is what ships to PyPI, and PyPI versions are immutable once uploaded.

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