Fast-follow for #2289 — matrix::ensure_all() (admin user, per-agent
sync, hive Space + chat-room provisioning/invites) ran periodically
every 30 minutes but only ever warn!'d to the journal on failure, so a
persistent problem (missing invites, broken admin token, etc.) was
invisible to the operator.
ensure_all() now returns bool (aggregate ok/fail across every
sub-step) instead of (), and both call sites in main.rs feed that into
a debounced SweepHealth("matrix_ensure_all", warn, threshold=2) —
matches the existing knowledge_pull pattern. A lone bad sweep
self-heals silently; two consecutive failures raise a banner that
clears on the next clean sweep.
forge::ensure_all()'s remaining independent steps are still open —
that sweep only runs once at startup (no periodic loop), so the
debounced pattern doesn't map as directly; left for a follow-up.
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