Merge origin/next into fix/ci-queue-wait-no-status

Resolve against #1148's purpose-sensitive rewrite: keep next's
queue-clear message format and terminal-failure split, re-apply the
null-statuses tolerance and zero-contexts-first classification
(the half #1148 did not carry). All four ci-queue-wait suites green
on the merged tree.

packages/mosaic/framework/tools/git/ci-queue-wait.sh

@@ -481,13 +481,21 @@ while true; do
             # (push=degraded-pass, merge=hold). Merge stays fail-closed:
             # no-status there may just mean CI has not reported yet.
             if [[ "$PURPOSE" == "push" ]]; then
-                echo "[ci-queue-wait] no status contexts on ${BRANCH} head (state=no-status) — no CI queue to wait on; queue clear."
+                echo "[ci-queue-wait] queue-clear state=no-status purpose=push branch=${BRANCH}; no queued or running CI."
                 exit 0
             fi
             echo "Error: ASSERTED_NOT_READY state=no-status purpose=${PURPOSE} branch=${BRANCH}." >&2
             exit 3
             ;;
-        terminal-failure|malformed|unknown)
+        terminal-failure)
+            if [[ "$PURPOSE" == "push" ]]; then
+                echo "[ci-queue-wait] queue-clear state=terminal-failure purpose=push branch=${BRANCH}; no queued or running CI."
+                exit 0
+            fi
+            echo "Error: ASSERTED_NOT_READY state=terminal-failure purpose=${PURPOSE} branch=${BRANCH}." >&2
+            exit 3
+            ;;
+        malformed|unknown)
             echo "Error: ASSERTED_NOT_READY state=${STATE} purpose=${PURPOSE} branch=${BRANCH}." >&2
             exit 3
             ;;