fix(webchat): route slash commands through agent command fast-path

docs/plans/state.json

@@ -1,6 +1,6 @@
 {
   "version": "1.0",
-  "updated_at": "2026-02-18",
+  "updated_at": "2026-02-19",
   "description": "Tracks the status of all Flynn plans and implementation phases",
   "plans": {
     "makefile-skills-convenience-targets": {
@@ -5548,6 +5548,17 @@
         "docs/plans/state.json"
       ],
       "test_status": "pnpm test:run src/channels/telegram/adapter.test.ts src/config/schema.test.ts src/gateway/handlers/services.test.ts src/cli/doctor.test.ts + pnpm typecheck passing"
+    },
+    "webchat-slash-command-agent-fastpath-fix": {
+      "status": "completed",
+      "date": "2026-02-19",
+      "updated": "2026-02-19",
+      "summary": "Fixed WebChat slash command reliability by routing /reset, /compact, /usage, /status, and /model through agent.send command metadata fast-path instead of mixed local RPC shortcuts. This resolves /model returning unknown and keeps command behavior aligned with backend command registry.",
+      "files_modified": [
+        "src/gateway/ui/pages/chat.js",
+        "docs/plans/state.json"
+      ],
+      "test_status": "pnpm typecheck + pnpm test:run src/commands/registry.test.ts src/commands/builtin/index.test.ts passing"
     }
   },
   "overall_progress": {