docs: point at the author's idea note, and log its first item

The author keeps ideas in an Obsidian note outside this repository. Nothing
in the repo pointed at it, so a fresh session would never find it and the
backlog would look complete while ideas sat unread. AGENTS.md now names the
path and the rule: the note is the inbox, the backlog is the tracked list,
and they are reconciled in both directions.

Item 3 is that note's one open idea, an API letting qtmaildir tag incoming
mail by resemblance to a kept case. It is recorded unsized and explicitly
marked as having no verified cause, because unlike items 1 and 2 there is
nothing built to verify. The entry records the real tension rather than just
the request: this tool has been deliberately mechanical, reporting what a
message declared and refusing rather than guessing, and a resemblance score
would be its first opinion. It also notes that source.eml is unredacted, so
matching must not become a route by which a stored recipient identifier
reaches a comparison.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wrfqr2xqQfhtXCscU7zrdz

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