sanity-check: verify global AGENTS.md symlink after recreate

pi-toolkit now symlinks pi-global-AGENTS.md -> ~/.pi/agent/AGENTS.md (pi's
global-instructions file, loaded at every start; directs the agent to read
the pi-extensions skill at session start). Add a recreate-sanity-check
assertion alongside the keybindings symlink check so a future image build
that bakes the new pi-toolkit verifies the wiring landed.

scripts/recreate-sanity-check.sh

@@ -6,8 +6,8 @@
 #     version is supplied — see the version note below)
 #   - Persisted named volumes survived (~/.pi config, shell history, zoxide,
 #     nvim data, uv cache, ssh-local)
-#   - pi runtime wiring is intact: keybindings symlink, ≥4 extensions, the
-#     mempalace.ts bridge, settings.json, and the pi-fork /
+#   - pi runtime wiring is intact: keybindings symlink, AGENTS.md symlink,
+#     ≥4 extensions, the mempalace.ts bridge, settings.json, and the pi-fork /
 #     pi-observational-memory / (studio variant) pi-studio package registrations
 #   - Shell defaults re-seeded from /etc/skel-devbox
 #   - /tmp/sshcm exists with mode 700 (ssh ControlMaster dir)
@@ -157,6 +157,14 @@ else
   fail "~/.pi/agent/keybindings.json missing or not a symlink"
 fi
 
+# global AGENTS.md symlink (pi-toolkit) — global instructions loaded by pi at
+# every start (directs the agent to read the pi-extensions skill at session start)
+if [ -L "$HOME/.pi/agent/AGENTS.md" ]; then
+  pass "~/.pi/agent/AGENTS.md symlink (pi-toolkit)"
+else
+  fail "~/.pi/agent/AGENTS.md missing or not a symlink"
+fi
+
 # extensions deployed (pi-extensions) — expect ≥4 *.ts
 EXT_COUNT=$(ls -1 "$HOME"/.pi/agent/extensions/*.ts 2>/dev/null | wc -l | tr -d ' ')
 if [ "$EXT_COUNT" -ge 4 ]; then