feat: Python client implementation for River protocol v2.0#356

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Commits on Feb 19, 2026

feat: add Python client implementation for River protocol v2.0
Monkatraz
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refactor: use esbuild to bundle test server from .ts source
Monkatraz
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test: expand test suite to 65 tests with cancellation, idempotent close, and Readable edge cases
Monkatraz
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