diff --git a/.graphlemon/runs/911861fe-446a-4bab-8b69-b4872b92d616/brd.md b/.graphlemon/runs/911861fe-446a-4bab-8b69-b4872b92d616/brd.md
new file mode 100644
index 0000000..fe34f03
--- /dev/null
+++ b/.graphlemon/runs/911861fe-446a-4bab-8b69-b4872b92d616/brd.md
@@ -0,0 +1,10 @@
+The graphlemon-node planner workflow completed. It produced a BRD for `supervisor/deploy_stage.py`'s concurrent-deployment mutex.
+
+Key finding: the gap-analysis doc's claim ("no mutex check") doesn't hold against current code — `src/schema.py` already has a `ux_deployment_active` partial unique index (from U-034) that atomically blocks concurrent non-terminal deployments, with INSERT happening before any destructive side effects. So the Planner narrowed scope to two real remaining gaps:
+
+1. G1 — `stage_deployment()` leaks a raw `sqlite3.IntegrityError` on conflict instead of a named, diagnostic exception (blocking `deployment_id`/`status`), inconsistent with the module's `<Xxx>Error` convention.
+2. G2 — tests only cover the `finalized` terminal-state allow-path; `rolled_back` and `blocked_pending_human` allow-paths lack explicit regression tests.
+
+Plus G3: both `unittest discover` suites (`src` and `supervisor`) must stay green.
+
+This was Planner-stage only (BRD artifact) — no code was changed. Awaiting direction on whether to continue the pipeline (PRD/SDD/Coder) or stop here.
\ No newline at end of file