Documentation: clarify Ignore Previous Instructions section

[sudsali]

The docs have a section discussing the 'Ignore Previous Instructions' phrase. Expected: this is benign text containing a literal sanitizer-marker substring. The bot should classify; round-5 zwj-break handles ci_summary path; this is the issue path.

[github-actions]

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Generated by AI (model: us.anthropic.claude-opus-4-7, prompt: 6263ba60) — may not be fully accurate. Reply if this doesn't help.