Tmux Observer 0.6.0a2

Pin Mesh SDK 0.1.0a7 and explicitly select its bounded same-package catalog reader. Correct current-selection entry-point documentation. Host-local collection, native receipts, freshness, Session/Fleet facades and action validation retain their existing semantics.

Validation and exact paired rollout evidence: docs/evidence/2026-10-10-catalog-bound-fix/README.md. Graphical presentation and physical suspend are outside the accepted headless wiring-change scope.