fix(plugin): write-path hooks say when Scribe did not answer — once per outage, shared marker, record nudge withheld on an unanswered call; check_plugin allows exactly that line when unreachable; plugin 0.1.43 (#2932)

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

plugin/hooks/scribe_defs.sh

@@ -11,6 +11,9 @@
 #   scribe_defs                stdin code → "kind<TAB>name" per definition
 #   scribe_local_dups ROOT REL "kind<TAB>name" lines on stdin → the by-name
 #                              local-duplicate lines (ARM 1, #2280)
+#   scribe_unreached STATE SID SECS REL  the "Scribe didn't answer" line, once
+#                              per outage (#2932) — or nothing, if said lately
+#   scribe_reached STATE SID   the server answered: the next outage speaks again
 #
 # Sourced, not executed: `. "$(dirname "${BASH_SOURCE[0]}")/scribe_defs.sh"`.
 
@@ -114,3 +117,31 @@ scribe_local_dups() {
     printf '> - `%s` is already defined in %s other file(s): %s\n' "$label" "$count" "$files"
   done
 }
+
+# ---------------------------------------------------------------------------
+# The blind spot made visible (#2932). Both write-path hooks fail OPEN when the
+# instance is slow or down — right for noise, wrong for silence: a session
+# cannot tell "the ledger checked and found nothing" from "the ledger never
+# answered", and a self-surfacing system cannot afford an invisible miss (the
+# first write after a redeploy lost its derive line to a 4s cold start and
+# nobody knew). So a failed call says so — ONCE per outage: the marker holds
+# the time it last spoke; within ten minutes of that it stays quiet, and a
+# successful call clears it so the next outage announces itself afresh.
+# Unconfigured installs never reach this: no URL/token means no call was owed.
+_SCRIBE_UNREACHED_QUIET=600
+
+scribe_unreached() {
+  local marker="$1/$2.unreached" now last
+  now=$(date +%s 2>/dev/null) || now=0
+  if [ -f "$marker" ]; then
+    last=$(cat "$marker" 2>/dev/null) || last=0
+    case "$last" in ''|*[!0-9]*) last=0 ;; esac
+    [ $((now - last)) -lt "$_SCRIBE_UNREACHED_QUIET" ] && return 0
+  fi
+  printf '%s' "$now" > "$marker" 2>/dev/null || true
+  printf '> Scribe did not answer the prior-art check for `%s` within %ss — this write went UNCHECKED against the record and the shape ledger (the local by-name arm, if it spoke above, needed no server). If the name matters, check it yourself: `search` for the concept, `list_shapes(project_id, path=…)` for the ledger. Said once per outage; if it keeps happening the instance is slow or down.' "$4" "$3"
+}
+
+scribe_reached() {
+  rm -f "$1/$2.unreached" 2>/dev/null || true
+}