The link-integrity pass ended in `is_file()`, and `.AGENTTRASH/` is a real directory on
this machine: a page pointing at `[x](.AGENTTRASH/gone.md)` passed the gate here and was a
dead link everywhere else, because the quarantine is gitignored. This is incident #57 — the
wikilink resolver resolving `[[log]]` onto a quarantined copy — reproduced in markdown
clothing, which is to say: fixing one resolver while leaving the identical assumption in the
other one is not a fix.
A link that lands inside the bundle must land on a page that belongs to the bundle. A link
that leaves the bundle is still honoured (`tools/live-sync.md` -> `../../AGENTS.md` points at
the operating contract, which is not bundle content and is real on disk). Red test added
first, both link spellings covered; nothing previously green changed.
Refs #64
Frank
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