Integrate session resume branch

[jasonsuhari]

Problem

The existing feat/resume-sessions branch diverged before recent GridBash features landed on main.

Requested behavior

Integrate session resume support from origin/feat/resume-sessions onto latest origin/main while preserving terminal-query replay/autoinput behavior, pane IDs, worktrees, sleep, rename, usage labels, and runtime resize.

Acceptance checks

• Session resume compiles and works with current main abstractions.
• Recent terminal/grid features remain intact.
• npm test passes.
• A PR is opened against main for review.