fix: the unattended rehearsal consents explicitly to the restore gate

CI's multi-user rehearsal drives 'box restore' with no terminal, so the
new gate correctly refused it. --force there is the drill proving the
gate is real. README says restore asks, and that scripts must pass it.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CHANGELOG.md

@@ -59,7 +59,11 @@ which records not just what changed but what each drill run proved.
   one verb that already worked would be a regression shipped as a
   refactor. A row marked `confirm` with no words is now a hard internal
   error rather than a blank question. `--force` and the no-TTY refusal come
-  free — `confirm()` already had both. Coverage went from two
+  free — `confirm()` already had both. The one automated caller had to
+  consent explicitly: `drill/multiuser.sh` drives restore unattended on real
+  Incus and now passes `--force`, which is the rehearsal proving the gate
+  rather than working around it — the CI run of this very PR failed there
+  first, which is the shape a gate is supposed to have. Coverage went from two
   argument-validation checks that never reached dispatch to the destructive
   path itself, driven against a fake incus: refusing leaves the call log
   empty, `--force` produces exactly one `incus snapshot restore`. Not

README.md

@@ -320,7 +320,10 @@ box new --name feature --from work/authed   # clone the authed state into a new
 
 `--from` copies the whole box (agent login, git creds, clones and all) while
 preserving isolation. You can also `box new --name x --from work` to clone
-a box's live state, or roll a box back with `box restore work authed`.
+a box's live state, or roll a box back with `box restore work authed` — which
+asks first, since a rollback discards everything since the snapshot (`--force`
+skips the prompt, and scripts must pass it: with no terminal to ask on, box
+refuses rather than assuming yes).
 
 Forgotten what you called a checkpoint? `box info work` prints the box's
 snapshot labels and the `--from` line to clone one.
@@ -388,7 +391,8 @@ box shell <box>              # enter as the template's user
 box exec <box> -- <cmd...>   # run a command in the box
 box tmux <box> [session]     # attach/create a tmux session — survives disconnects
 box snapshot <box> [label]   # checkpoint (label defaults to manual-<epoch>)
-box restore <box> <snap>     # roll back to a snapshot
+box restore <box> <snap> [--force]
+                             # roll back to a snapshot — destructive, asks first
 box export <box> [<file>] [--instance-only]
                              # one portable file (snapshots incl.) — survives rm & host
 box import <file> [--name <box>]

drill/multiuser.sh

@@ -206,7 +206,13 @@ as_u "$U1" box info mine 2>/dev/null | grep -qF "$(boxnet_pfx)" \
   && ok "(g) box info shows a boxnet ($(boxnet_pfx)x) address — placed on the hardened network" \
   || no "(g) mine has no boxnet address in box info"
 as_u "$U1" box snapshot mine s1 >/dev/null 2>&1 && ok "(b) box snapshot mine s1" || no "(b) snapshot refused"
-as_u "$U1" box restore mine s1 >/dev/null 2>&1 && ok "(b) box restore mine s1 (the incus 6 'snapshot restore' spelling)" || no "(b) restore failed"
+# --force, and it is the assertion as much as the fix: restore is destructive
+# and now asks (#105), so an unattended drill MUST consent explicitly. Without
+# the flag this line fails — correctly — because confirm() refuses rather than
+# assuming yes when there is no terminal to ask on. Adding --force here is not
+# working around the gate; it is the drill proving the gate is real, and that
+# the documented non-interactive path through it works on real Incus.
+as_u "$U1" box restore mine s1 --force >/dev/null 2>&1 && ok "(b) box restore mine s1 --force (the incus 6 'snapshot restore' spelling, through the #105 gate)" || no "(b) restore failed"
 as_u "$U1" box new --name c1 --from mine/s1 >/dev/null 2>&1 && ok "(b) box new --from mine/s1 — the clone workflow" || no "(b) clone failed"
 # c1 stays alive through phase g: it is the distinctly-NAMED sibling the
 # enumeration probe needs (both users' primaries are 'mine' by design of d).

test/cli.sh

@@ -877,6 +877,11 @@ check "table: every 'confirm' row supplies a prompt (#105)" 0 "" \
 # shellcheck disable=SC2016  # the $-strings are literals in the target file
 check "dispatch: the confirm prompt comes from the row, not a constant (#105)" 0 "" \
   grep -qF 'confirm "$(fill "$cnf" "$inst")"' "$ROOT/bin/box"
+# The rehearsal drives restore unattended on real Incus, so it must consent
+# EXPLICITLY — the gate is only real if the one automated caller had to change.
+# Pinned here because the rehearsal itself needs a daemon and this suite has none.
+check "rehearsal: the unattended restore passes --force (#105)" 0 "" \
+  grep -qF 'box restore mine s1 --force' "$ROOT/drill/multiuser.sh"
 rm -rf "$CSHIM" "$CWORK"
 
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