Challenge 3 — Solution

Task: Explain what SB10's own "confirmed working" note is actually
claiming, and why that's a stronger, more useful statement than the
original folder-structure decision alone would have been.

What "confirmed working" is actually claiming: not just that
organizing Sidebar content into content/sidebar/<subject>/ folders was
a reasonable design choice, but that this exact structure was later
checked against the real, live, rebuilt site's own routing behaviour
and genuinely does auto-generate a working index page per Subject,
with zero manually-written index file anywhere. It's a claim about
verified, observed outcome, not just about intention.

Why this is stronger than the original decision alone: the original
folder-structure decision was made as a bet, before the site rebuild
that would actually test it existed - a reasonable, well-argued bet,
but still fundamentally a prediction about how a not-yet-built system
would behave. A prediction, however well-reasoned, is a different kind
of claim than a confirmed result - a rebuild could easily have turned
out differently than expected (different routing conventions, no
auto-index feature at all), which would have meant the original
folder structure needed rethinking. By actually checking the real
outcome afterward and updating the rule to say "confirmed working"
rather than leaving it as "expected to work," the rule now tells a
future reader something genuinely more useful: not "here was our
plan," but "here is what we know actually happens."

Notes:
- This directly mirrors the evidentiary standard this whole course
  keeps returning to - Chapter 1's R1-deprecation finding and Chapter
  5's broken-back-link finding are both examples of the same
  discipline: check the real, current state of the system rather than
  trusting what a rule says should be true.
- The distinction between "expected to work" and "confirmed working"
  is exactly the kind of small wording choice that makes a rules file
  more trustworthy over time - a reader can tell at a glance which
  claims in this system have actually been verified against reality
  and which are still just documented intentions.