docs(api): clarify Tailscale auth config key

docs/api/PROTOCOL.md

@@ -131,7 +131,7 @@ If `server.tailscale_identity` is enabled, connections from Tailscale are truste
 
 ```javascript
 // Automatic when connecting via Tailscale
-// No additional auth required if trustTailscaleIdentity: true
+// No additional auth required if server.tailscale_identity is enabled
 ```
 
 ### HTTP Auth

docs/plans/state.json

@@ -24,6 +24,11 @@
       "date": "2026-02-15",
       "summary": "Docs fix: updated docs/deployment/PRODUCTION.md to match the repo's actual Dockerfile (pnpm/corepack) and docker-compose.yml, and corrected the config YAML snippet to use models.default.provider/model/api_key per the current config schema."
     },
+    "docs-protocol-tailscale-auth-wording": {
+      "status": "completed",
+      "date": "2026-02-15",
+      "summary": "Docs fix: clarified the Tailscale auth note in docs/api/PROTOCOL.md to reference server.tailscale_identity."
+    },
     "openclaw-gap-roadmap": {
       "file": "2026-02-15-openclaw-gap-roadmap.md",
       "status": "planned",