kerf triage: suggester does not detect archived works (proposes kerf new for archived codenames)

[gregberns]

For a 1-bead 'codename:imrest' cohort, triage suggests 'kerf new imrest' even though imrest is archived at ~/.kerf/archive/kerf-explore-b/imrest/. The suggester has no awareness of archive state. Should at minimum annotate '(archived — consider unarchive or re-pin)'.
Discovered: docs/kerf-beta-feedback.md — work bead_filter bootstrap, friction item 4.
Severity: MAJOR.

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Migrated from harmonik bead hk-rvbxi.