setup-shelllisted

# Set Up Agent Guard Shell Install or refresh Agent Guard shell command masking without making the user locate the versioned plugin-cache binary. ## Workflow 1. Explain that this changes the user's shell rc and is separate from plugin hook setup. 2. Resolve `../../bin/agent-guard` relative to this skill directory and confirm that it is executable. Use that plugin-local binary even if another `agent-guard` is on `PATH`; do not install or update a standalone copy. 3. Tell the user that `setup-shell` will update the managed block in their shell rc with command wrapping enabled by default. Obtain host approval for the home-directory write before running: ```sh "<plugin-local-agent-guard>" setup-shell ``` 4. On success, report the rc path from the command output and tell the user to restart the shell and any agent sessions launched from that shell. 5. If the approved write is blocked by the host sandbox, relay the exact error. Do not retry the same blocked write, choose another rc, or edit the rc by hand. Show the exact plugin-local command for the user to run directly in a terminal, wait for confirmation, and then report the required restarts. Use `setup-shell --no-command-wrapping` only when the user explicitly requests the persistent opt-out. `AGENT_GUARD_COMMAND_WRAPPING=off` is the runtime-only opt-out.