Remove em dashes across the wiki
Match the repository, which no longer uses them anywhere. Rewrite each
sentence rather than swapping the character.
Seven of these were not style: they quoted banner sentences the program
no longer prints, so they now match diagnosis.go again.
The six verdict headings lost their dashes too, which changes the anchor
GitHub derives from each one. Each keeps an explicit anchor at its old
slug so links already published elsewhere still land.
Add explanatory wiki
Twelve content pages plus sidebar and footer, covering usage, diagnosis,
architecture, the simulator, Challenge Mode, hunts, and contributing.
The wiki owns explanation only. Exact flags, defaults, exit codes, and
inventories stay in the repository, where they change in the same commit as
the code and are enforced by tests. Documentation-Map records that boundary.
No repository document was moved, shortened, or duplicated here; in
particular the wiki contains no literal challenge ids, since the test that
keeps those current cannot see these pages.