tooling: histcapture.py (auto HIST-QNA capture) + systemd timer

Captures user/assistant messages from /root/.hermes/state.db into the
'hermes' cube namespace as TYPE: HIST-QNA entries. Forward-only by default
(no backfill); --seed-hours N for bounded one-time population; idempotent;
--prune-older-than-hours to undo over-backfill. systemd timer runs every
5 min. Tested: 24h seed = 1171 msgs; prune cleared a 3164-entry backfill
to 44, then re-seeded correctly.

tools/histcapture.timer

@@ -0,0 +1,11 @@
+[Unit]
+Description=Periodically capture Hermes history into the cube 'hermes' namespace
+
+[Timer]
+OnBootSec=30s
+OnCalendar=*:0/5
+Persistent=true
+Unit=histcapture.service
+
+[Install]
+WantedBy=timers.target