💡 Motivation and Context

Fixes #526, #308, and #173.

This PR addresses the severe, straightforward bug reports from the open issue triage:

• local feature flag 401 errors now include the server error and mention both project_api_key and personal_api_key instead of always blaming only personal_api_key
• oversized queued events are acknowledged when dropped so flush() does not hang forever
• disabled/no-op usage no longer requires an API key before returning early

New feature requests and more invasive fixes were intentionally left out.

💚 How did you test it?

• uv run pytest posthog/test/test_consumer.py posthog/test/test_client.py posthog/test/test_feature_flags.py posthog/test/test_module.py -q
• uv run ruff format --check .
• uv run ruff check .

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

If releasing new changes

• Ran sampo add to generate a changeset file
• Added the release label to the PR