fix: pre-landing review fixes

Review army findings (1 critical, auto-fixed with regression tests):

- CRITICAL (security specialist, verified live): redactFindingSpans spliced
  only the regex capture span, and pem.private_key / gcp.service_account
  capture just the BEGIN-header — the key body survived "redaction" and
  shipped via telemetry. Marker-only patterns now drop the whole payload
  (null, fail closed). Overlapping spans (Bearer+JWT on the same bytes) are
  coalesced before splicing so stale offsets can't leave partial secret
  bytes behind.
- gitStrict: drop the dead `|| r.status === null` disjunct (null !== 0
  already covers it); add the signal-kill/null-status regression test the
  docstring promised.
- security-dashboard human mode flags stale snapshots ("figures may be out
  of date") instead of presenting frozen counts as current.
- community-dashboard marker check uses jq when available — the grep-only
  variant misclassified whitespaced/reserialized bodies as legacy.
- telemetry fail-closed test now shadows bun with a failing stub
  (deterministic on any host layout); stale "five status cases" describe
  title renamed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

bin/gstack-community-dashboard

@@ -57,7 +57,14 @@ WEEKLY="$(echo "$DATA" | grep -o '"weekly_active":[0-9]*' | grep -o '[0-9]*' ||
 CHANGE="$(echo "$DATA" | grep -o '"change_pct":[0-9-]*' | grep -o '[0-9-]*' || echo "0")"
 
 echo "Weekly active installs: ${WEEKLY}"
-if ! printf '%s' "$DATA" | grep -q '"status":"ok"'; then
+# Marker check: jq when available (whitespace/reserialization-proof); grep
+# fallback only matches the compact form the edge function emits today.
+if command -v jq >/dev/null 2>&1; then
+  _MARKER="$(printf '%s' "$DATA" | jq -r '.status // empty' 2>/dev/null)"
+else
+  _MARKER="$(printf '%s' "$DATA" | grep -q '"status":"ok"' && echo ok || true)"
+fi
+if [ "$_MARKER" != "ok" ]; then
   echo "  (unverified — legacy backend response; deploy the latest community-pulse for verified figures)"
 fi
 if [ "$CHANGE" -gt 0 ] 2>/dev/null; then