Stage 17: path-conditional CI behind an aggregate gate + connector liveness probe; Grafana move-duration panel

- #10 a `changes` job path-filters unit/integration/ui; an always-running `gate` job aggregates them (success-or-skipped) and becomes the only required check
- #9 deploy adds a Telegram-connector liveness probe (docker inspect: running, not restarting, stable restart count) with a VPN-handshake grace period
- #1a Game-domain dashboard gains a 'Move think-time by phase (p50/p95)' panel
- deploy README: branch protection now requires only CI / gate

deploy/grafana/dashboards/game-domain.json

@@ -4,7 +4,7 @@
   "tags": ["scrabble"],
   "timezone": "",
   "schemaVersion": 39,
-  "version": 1,
+  "version": 2,
   "refresh": "30s",
   "time": { "from": "now-24h", "to": "now" },
   "panels": [
@@ -54,6 +54,18 @@
       "fieldConfig": { "defaults": { "unit": "s" }, "overrides": [] },
       "datasource": { "type": "prometheus", "uid": "prometheus" },
       "targets": [{ "refId": "A", "expr": "histogram_quantile(0.95, sum(rate(game_move_validate_duration_bucket[5m])) by (le, variant))", "legendFormat": "{{variant}}" }]
+    },
+    {
+      "type": "timeseries",
+      "title": "Move think-time by phase (p50 / p95)",
+      "description": "Seconds a seat spent on a committed move, by game phase. Aggregates all seats including robots; per-human analysis is in the admin console.",
+      "gridPos": { "h": 8, "w": 12, "x": 0, "y": 24 },
+      "fieldConfig": { "defaults": { "unit": "s" }, "overrides": [] },
+      "datasource": { "type": "prometheus", "uid": "prometheus" },
+      "targets": [
+        { "refId": "A", "expr": "histogram_quantile(0.5, sum(rate(game_move_duration_bucket[15m])) by (le, phase))", "legendFormat": "p50 {{phase}}" },
+        { "refId": "B", "expr": "histogram_quantile(0.95, sum(rate(game_move_duration_bucket[15m])) by (le, phase))", "legendFormat": "p95 {{phase}}" }
+      ]
     }
   ]
 }