Borrow the provider tracker queries from cecb1e9. Keep unavailable state unknown, bind incremental views to acknowledged source entries, reset after compaction, bound serialized payloads, and recheck tracked work at sign-off.
Scope messages to each pairing, wait for supervisor readiness, retain instructions in session history until acknowledgment, and rejoin after disconnect. Reuse installed Intercom or load the package dependency. Validate over an isolated real broker; existing user panes are untouched.
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