restore: re-merge ORCH-069 qg0_title_max

# Conflicts:
#	CHANGELOG.md

.env.example

@@ -213,3 +213,10 @@ ORCH_POST_DEPLOY_FAIL_THRESHOLD=3
 ORCH_POST_DEPLOY_5XX_THRESHOLD=0.5
 ORCH_POST_DEPLOY_AUTO_ROLLBACK=false
 ORCH_POST_DEPLOY_BASE_URL=http://localhost:8500
+
+# ── QG-0 entry validation (ORCH-069) ──────────────────────────────────────────
+# Upper title-length limit for the QG-0 entry gate (_qg0_errors). The old 80-char
+# cap was a hygiene limit, not structural (slug is cut to [:30] independently, the
+# DB title TEXT is unbounded). Default 200. An invalid/empty value gracefully
+# degrades to 200 (the process never crashes on startup).
+ORCH_QG0_TITLE_MAX=200