Personal-link observations need named query lenses — without them, an accumulating fact log goes uninspected

The `has_personal_link` observation predicate added with the PersonalLinks pulse-dimension stores rich qualifiers (`kind`, `title`, `url_domain`, `org_id`) that we expect to query in specific shapes — per-person presence rollup, per-org corpus rollup, kind-filtered slices for analyst views. None of those queries exist yet. As personal-links accumulate (a single thought leader can easily contribute 50+), the operator will hit 'I have the data but no way to look at it' unless we name the lenses up front and ship them as we hit the friction.