Release Python SDK 2.0.1

[rmcdaniel]

Addresses #50

What changed

• prepare the replay correction merged in Keep post-condition receivers on their replay boundary #51 as Python SDK 2.0.1
• give 2.0.0 and 2.0.1 dated changelog sections
• allow canonical 2.0.x patch identities in repository-owned release validation
• retain Server 2.0.0 and worker protocol 1.19 compatibility

Evidence

• full non-integration suite: 1,302 passed, 2 skipped
• release metadata and PyPI surface tests: 22 passed
• Ruff on changed release files and strict mypy: passed
• wheel and sdist metadata: matched exact source
• Twine and installed-package smoke checks: passed
• public-boundary scan: passed