box-session-resume-grant

On the host side, grant (execute) a box session resume request that a box-internal /box-session-resume wrote to .claude/host-bridge/resume-req-<box-name>-<seq>.md. Reads the request, displays the operation (which session → which dest) for the human to eyeball, runs scripts/internal/box-session-resume.sh on the host (where sbx can reach the boxes) to inject the transcript into the destination, then writes the result to resume-ans-<box-name>-<seq>.md and touches a done sentinel so the box-side Monitor auto-picks it up. The host-side, user-triggered half of the box→host resume delegation — the human running this is the injection gate. Counterpart of /box-session-resume's box-delegate mode (mirrors /host-answer, but executes a state change rather than read-only investigation). Use when the user says a box wrote a resume request and wants the host to grant it, mentions resume grant / box の resume 依頼を実行 / resume を host で代行.