R-2 was owed by Cut 1 and not yet done (docs/cultnet-selection-cut.md, section
9, Self's rulings 2026-09-22): a v0-only Python peer must refuse a
cultnet.selection.v1 carrier message loudly instead of silently answering
with an empty list.
- packages/cultnet-py/src/cultnet_py/interop_peer.py:
handle_server_message's fallback now recognises any cultnet.*.v1 schema
version and replies cultnet.error.v0 { code: "unsupported_schema_version",
details: { schemaVersion } } via the new unsupported_schema_version_error
helper, matching cultmesh_py's existing error shape. One test
(test_python_interop_peer_refuses_v1_selection_messages) proves a
snapshot_request.v1 and a database_subscribe.v1 message both get the
refusal, not an empty list.
- packages/cultmesh-py/src/cultmesh_py/server.py's delegating path
(_handle_connection_message -> handle_message) already refused every
unsupported schema version generically, v1 included - no code change
needed there. test_cultmesh_local_server_returns_errors_for_bad_requests
gains an explicit assertion for a snapshot_request.v1 message through that
same path, so the coverage is named rather than only implied by the
generic case.
This is the one exception to "do not touch packages/" in this fix batch: only
these two Python packages' interop/server files and their tests.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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