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Code-review changes: - Replace module-level `_v1_*_warning_emitted` booleans with `functools.cache`- decorated `_emit_v1_*_deprecation` helpers. Bare module globals had a read-then-write race under multi-threaded WSGI workers; functools.cache is thread-safe under the GIL and produces actually-once-per-process semantics without the noqa: PLW0603 escape hatch. - Mention `groups:read` (in addition to `channels:read`) wherever the scope requirement appears: deprecation message constant, config.py comment, the scope-missing logger.warning, UPDATING.md, and (auto-synced) feature-flags.json. The v2 channel resolver queries both public_channel and private_channel types, so granting only `channels:read` silently breaks private-channel reports. - Add `test_propagates_non_slack_api_errors_from_probe` — locks in that any exception other than SlackApiError (network, transport) propagates out of should_use_v2_api rather than masquerading as a missing-scope warning. - Drop a tautological `assert_not_called()` on `get_channels_with_search` in the auto-upgrade round-trip test. SlackV2Notification.send() never calls that helper in any path, so the assertion was true by construction rather than by the test exercising a real fast path. - Pin assertions on the deprecation-warning *message* to the exported `_SLACK_V1_DEPRECATION_MESSAGE` constant instead of substring fragments. - Update the test autouse fixture to clear the new functools.cache caches rather than reset the now-removed module globals. Three architectural concerns from review (auto-upgrade transaction race, concurrent worker upgrade race, end-of-deprecation cleanup migration) are pre-existing on the upgrade path and tracked as separate follow-up tasks rather than expanded into this PR. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>