Aggregates the OTHER Plane-1 checkers' latest reports (compliance-drift,
dependency-cve, doc-drift, confluence-doc) into one prioritized, deduped
"groomed weekly plan" written into the mode-600 report. REPORT-ONLY per
decision D3: posts NOTHING to Slack; auto-write to Notion/Jira is a later
toggle (inert --notify seam). Reuses lib/sweep_substrate.sh redact().
Offline --canary asserts the groomed-plan item count (5) against a fixture
report set, exercising latest-date selection, dedup, multi-source aggregation,
and no-data discipline (a missing source is noted, never invented as work).
shellcheck-clean (only the shared SC1091 substrate-source info, at parity with
compliance-drift/dependency-cve). PROVISIONING (auto-write toggle, systemd
wiring, coordinator registry) deferred — gated.
