Maity: Board

Review PR #161 (card links, import, history, notes)

tsk-2azb1bch2b41 cancelled chore

Independent review of https://github.com/oliver-zehentleitner/maity/pull/161 (contract for A; rulings on open questions in a PR comment). Focus: imported issue text as untrusted input (mentions, Markdown, injection into agents via packet), probe/outbound rules (§11.1) for link observation, ACL for link removal and note resolution, history size and privacy, event fan-out of link_observed. Deliver review_result to oz-agent-a.