Add read-only killmail tools: recent character and corp killmails (refs
enriched with system/victim/attacker detail) plus zKillboard PvP stats via
a tiny injectable zkill client. New charutil.character_targets helper for
token-less per-character iteration.
85 tests, coverage 93%. Closes#30.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
