fix: give reopen checks the original report, log every verdict

[lihsaa591]

Summary

• A reopened conversation's Stage-1 check only classified messages since the last resolve, with no context on what the original report even was. Traced this to a real missed bug (User Registration session_82095c36): every increment ("we replicated it", "here's the fix zip") read as routine internal follow-up on its own, so it never escalated across multiple runs, silently.
• Pairs the delta with the conversation's opening messages (capped, not the full history) so the classifier has enough context to judge correctly.
• Logs the classifier's verdict on every reopen and stale-auto check, not just escalations, so a skip shows up in the run log instead of vanishing without a trace.

Test plan

• node --check scripts/crisp-classify.mjs
• Watch the next scheduled Crisp triage run's summary for the new "not actionable" log lines to confirm they appear as expected

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