berth updates

berth/ctrl/selftest.sh

@@ -169,6 +169,32 @@ check "generated output is ignored" "yes" \
 check "key material is ignored" "yes" \
     "$(cd .. && git check-ignore -q ctrl/.secrets/vpn/any.key && echo yes || echo no)"
 
+note "capture and the checks that read it — three bugs found by running, 2026-09-14"
+
+# 1. A placed service's upstream is DERIVED (✖ B9). Anything reading the raw
+#    `upstream` field sees "" and skips it — which is how vpn.sh's bindings
+#    invariant, the "my configurations broke" detector, went quiet the day
+#    placement landed while still printing OK. Vacuous passes are the failure
+#    mode this whole file exists to catch.
+check "a placed service resolves to a real upstream" "10.8.0.2:3000" \
+    "$(bash -c 'source ./lib/config.sh; source ./lib/estate.sh; load_config >/dev/null;
+       service_upstream "" local nrft 3000')"
+check "bindings actually inspects a service" "1" \
+    "$(bash ./vpn.sh check 2>/dev/null | grep -c 'no service currently has an overlay address' \
+       | awk '{print 1-$1}')"
+
+# 2. A listen port belongs to a PEER. The roaming peer's is an ephemeral source
+#    port; writing it to the overlay renames the port the firewall rule is
+#    checked against — silently, since both are plausible integers.
+check "a roaming peer's port is not the overlay's port" "51820" \
+    "$(python3 -c 'import json;print(json.load(open("../estate/mcrn.json"))["vpn"]["overlays"]["estate"]["listen_port"])')"
+
+# 3. _status is always non-empty — capture rewrites it rather than clearing it —
+#    so a warning gated on "is it set" can never turn off, including after the
+#    capture it asks for. Gate on the structure instead.
+check "the capture warning clears once keys are in" "0" \
+    "$(bash ./check.sh 2>/dev/null | grep -c 'public keys not captured')"
+
 note "every STALE entry has a check here"
 
 # Not "$0": line 15 cd's into this script's directory, so a relative $0 no