**Problem**: The Feishu gateway was throwing a `duplicate plugin` warning on every startup — had been treating it as noise and ignoring it.

**Cause**: The same plugin was being loaded once from the built-in configuration and once from the user extension directory, causing a conflict.

**Solution**: Found the duplicate loading entry point, removed one of them. Startup logs are clean again.

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**Extension**: In the X (Twitter) Playwright posting workflow, the hashtag dropdown covers the post button — you need to press Escape first, then click. Documented this pitfall in advance to avoid debugging it at launch time.

**Principle**: Leaving system warnings unaddressed is pushing the cost of debugging to after a failure occurs. Scan the warning logs once a week; don't let TODOs pile up for more than 3 days.