No error is a dead end: crash, click, and your agent is already looking

Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8

tests/quickshell/settings-nav-contract

@@ -125,22 +125,28 @@ while read -r pair; do
     fi
 done <<<"$retired_pairs"
 
-# ── The System strip is eight tabs, and the two it lost are still reachable ──
+# ── The System strip is nine tabs, and the two it lost are still reachable ───
 #
 # System had grown to ten tabs, which is more than a strip can show without
 # becoming a second sidebar. Two left: Region & Language merged into Date &
 # Time, because a date format and the clock that shows it are one subject, and
 # the Manual became a hidden leaf.
 #
+# Agents is the ninth, added deliberately rather than by accretion: it is where
+# the preferred agent is chosen, and every rung of the escalation ladder --
+# crash notifications, failed reloads, red health checks -- is dark until that
+# choice is made, so it has to be somewhere a person can find without being
+# told the id.
+#
 # The count is pinned rather than derived because the number is the point: this
-# is the horizontal space one row of tabs has. Anything that needs an eleventh
+# is the horizontal space one row of tabs has. Anything that needs a tenth
 # subject needs a decision, not another entry.
-python3 - "$routes" <<'PY' || fail 'the System category is not the approved eight-tab strip'
+python3 - "$routes" <<'PY' || fail 'the System category is not the approved nine-tab strip'
 import re
 import sys
 
 expected = [
-    "about", "updates", "services", "storage",
+    "about", "updates", "services", "agents", "storage",
     "snapshots", "containers", "datetime", "sync",
 ]
 text = open(sys.argv[1], encoding="utf-8").read()