Exercise 1: Why the Ruled-Out Cache Theory Stayed in the Record — Possible Solution
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WHAT THE 10:24 ENTRY RECORDS
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Per the capstone's timeline, "Theory: results cache serving stale/empty
entries. Checked directly - cache is passing through correctly. Ruled
out." A reasonable hypothesis was formed, tested directly, and found
not to be the cause.

WHY CHAPTER 5's OWN RULE APPLIES HERE
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Per Chapter 5, "an incident that looks clean and linear in hindsight
almost never was, in the moment. Wrong theories checked and ruled out
are a completely normal part of real diagnosis - they belong in the
record exactly as they happened, not smoothed away to make the
investigation look more efficient than it actually was." The cache
theory in this capstone is a direct instance of exactly this: a
genuinely reasonable idea that turned out to be wrong, which is
precisely the kind of entry Chapter 5 says belongs in a timeline, not
one that should be edited out afterward.

WHY IT'S USEFUL, NOT JUST HARMLESS
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Per Chapter 5, ruled-out theories are "precisely what Chapter 9's
post-incident review needs: it's what actually made the incident hard
to diagnose." Keeping the cache-theory entry preserves evidence of the
real investigative path taken - useful for anyone reviewing how the
incident was actually diagnosed, not just what the final answer turned
out to be.

WHY THIS WORKS AS AN ANSWER
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It correctly identifies the entry's content, applies Chapter 5's own
explicit rule about keeping ruled-out theories in the timeline, and
explains why this specific instance in the capstone is a real
application of that rule rather than an accident of how the story was
written.