Add inline setup card for web search failures in Excel add-in
Takeaway: Next time I'd front-load the dev-mode vs production proxy-probing distinction in the first prompt, since that's exactly the false-positive Codex caught later.
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Fix prompt-caching context-usage bug and harden /compact in Excel taskpane
Takeaway: Next time I'd point straight at Pi's own compaction implementation as the reference from the start, since checking 'what does Pi do' twice (for token budgeting and for the temperature/reasoning conflict) was what actually resolved both the context % bug and the mysterious /compact 400 error.