feat: add /research command with sub-agent delegation

docs/plans/state.json

@@ -3,6 +3,22 @@
   "updated_at": "2026-02-17",
   "description": "Tracks the status of all Flynn plans and implementation phases",
   "plans": {
+    "research-agent-command-quickstart": {
+      "status": "completed",
+      "date": "2026-02-17",
+      "updated": "2026-02-17",
+      "summary": "Implemented a first-class `/research` chat command that delegates to `agent_configs.research` through the command fast-path service layer, with clear fallback messages when the research agent is missing. Added README quickstart guidance and aligned default config examples for a safe research profile.",
+      "files_modified": [
+        "src/commands/types.ts",
+        "src/commands/builtin/index.ts",
+        "src/commands/builtin/index.test.ts",
+        "src/daemon/routing.ts",
+        "README.md",
+        "config/default.yaml",
+        "docs/plans/state.json"
+      ],
+      "test_status": "pnpm test:run src/commands/builtin/index.test.ts passing"
+    },
     "verbose-only-tool-inventory-output": {
       "status": "completed",
       "date": "2026-02-17",