feat(n8n): add get-logs action

skills/n8n-webhook/references/openclaw-action.md

@@ -10,8 +10,9 @@ It implements a real local OpenClaw → n8n router.
 
 - accepts `POST /webhook/openclaw-action`
 - normalizes incoming JSON into an action contract
-- supports two live actions:
+- supports three live actions:
   - `append_log`
+  - `get_logs`
   - `notify`
 - returns normalized JSON responses
 - returns `400` for unknown actions
@@ -32,6 +33,24 @@ Example stored record:
 {"ts":"2026-03-12T07:00:00Z","source":"openclaw-action","request_id":"abc","text":"backup complete"}
 ```
 
+### `get_logs`
+
+- reads from workflow static data key:
+  - `actionLog`
+- returns newest-first
+- default `limit` is `20`
+- clamps `limit` to `1..50`
+
+### `notify`
+
+- sends a Telegram message using credential:
+  - `Telegram Bot (OpenClaw)`
+- sends a Discord message using credential:
+  - `Discord Bot Auth`
+- current targets mirror the already-working reminder workflow
+
+## Why workflow static data for logs
+
 Why this first:
 - built-in, no extra credentials
 - persists without guessing writable filesystem paths
@@ -43,14 +62,6 @@ When to use MinIO later:
 - large/batched exports
 - sharing logs outside n8n
 
-### `notify`
-
-- sends a Telegram message using credential:
-  - `Telegram Bot (OpenClaw)`
-- sends a Discord message using credential:
-  - `Discord Bot Auth`
-- current targets mirror the already-working reminder workflow
-
 ## Intentional security choice
 
 The exported workflow leaves the Webhook node auth unset in the JSON file.
@@ -92,6 +103,7 @@ After import, set this manually in n8n:
 ```bash
 export N8N_WEBHOOK_SECRET='YOUR_SECRET_HERE'
 scripts/call-action.sh append_log --args '{"text":"backup complete"}' --pretty
+scripts/call-action.sh get_logs --args '{"limit":5}' --pretty
 scripts/call-action.sh notify --args '{"title":"Workflow finished","message":"n8n router test"}' --pretty
 ```
 
@@ -118,6 +130,30 @@ scripts/call-action.sh notify --args '{"title":"Workflow finished","message":"n8
 }
 ```
 
+### get_logs
+
+```json
+{
+  "ok": true,
+  "request_id": "",
+  "result": {
+    "action": "get_logs",
+    "status": "ok",
+    "count": 1,
+    "total_retained": 1,
+    "retained_entries": 200,
+    "entries": [
+      {
+        "ts": "2026-03-12T08:42:37.615Z",
+        "source": "openclaw-action",
+        "request_id": "live-log-003",
+        "text": "n8n append_log static-data verification"
+      }
+    ]
+  }
+}
+```
+
 ### notify
 
 ```json