feat: bootstrap repo — enforcement layer + #685 perf capture

Enforcement (check-rules/hooks/shellcheck) per ADOPTING pattern; perf/ SoR
from the #685 session (memcensus, pg role-caps SQL, applied sysctl, planned
daemon.json); questions-v1 (API token + dockerd window asks).

Meat + verification: https://projects.knownelement.com/issues/727#note-3913

perf/memcensus.sh

@@ -0,0 +1,30 @@
+#!/bin/sh
+# perf/memcensus.sh — per-app memory limit vs usage census on tsys-cloudron [#685]
+#
+# Final v3 (v1/v2 had usage-parsing bugs; superseded). Reports per-container
+# waste (limit minus usage) for apps with >=1GB limits — the basis for the
+# memory-slider shrink table on Discourse t/316.
+#
+# Run (read-only, from a KNEL/PFVCluster checkout):
+#   VM_IP=my.knownelement.com VM_USER=root timeout 120 bash tests/remote.sh vm-file perf/memcensus.sh
+# Needs: docker + awk on the host.
+# memory census v3 [#685]
+docker stats --no-stream --format "{{.Name}} {{.MemUsage}}" > /tmp/ms3.txt
+docker ps --format "{{.Names}}" | while read -r n; do
+  lim=$(docker inspect "$n" --format '{{.HostConfig.Memory}}' 2>/dev/null)
+  fq=$(docker inspect "$n" --format '{{range .Config.Env}}{{println .}}{{end}}' 2>/dev/null | grep -m1 '^CLOUDRON_APP_DOMAIN=' | cut -d= -f2)
+  [ -z "$fq" ] && fq=$(docker inspect "$n" --format '{{.Config.Image}}' 2>/dev/null | sed 's|.*/||;s|:.*||')
+  echo "$n|$fq|$lim"
+done > /tmp/ml3.txt
+awk 'NR==FNR {
+    gsub(/,/,"");
+    if ($2 ~ /G/) u[$1] = $2 * 1024; else u[$1] = $2 + 0;
+    next
+  }
+  {
+    split($0, f, "|")
+    lim = f[3] / 1048576
+    use = u[f[1]] + 0
+    if (lim >= 1024)
+      printf "%7.0fMB | %-46s | %6.0fMB | %6.0fMB | %3.0f%%\n", lim - use, f[2], lim, use, (lim ? use / lim * 100 : 0)
+  }' /tmp/ms3.txt /tmp/ml3.txt | sort -t'|' -k1 -rn | head -30