feat(auth): add anthropic api key storage and cli auth

docs/plans/state.json

@@ -75,6 +75,20 @@
       ],
       "test_status": "pnpm test:run src/gateway/handlers/services.test.ts src/gateway/handlers/handlers.test.ts + pnpm typecheck passing"
     },
+    "anthropic-auth-cli": {
+      "status": "completed",
+      "date": "2026-02-14",
+      "summary": "Added `flynn anthropic-auth` to securely store an Anthropic API key in ~/.config/flynn/auth.json and wired model client creation to use ANTHROPIC_API_KEY or stored credentials when config omits api_key.",
+      "files_modified": [
+        "src/auth/anthropic.ts",
+        "src/auth/anthropic.test.ts",
+        "src/auth/index.ts",
+        "src/cli/anthropic-auth.ts",
+        "src/cli/index.ts",
+        "src/daemon/models.ts"
+      ],
+      "test_status": "pnpm test:run src/auth/anthropic.test.ts + pnpm typecheck passing"
+    },
     "p0-p1-implementation-plan": {
       "file": "2026-02-06-p0-p1-implementation-plan.md",
       "status": "completed",
@@ -1891,7 +1905,7 @@
   },
 
   "overall_progress": {
-    "total_test_count": 1629,
+    "total_test_count": 1631,
     "all_tests_passing": true,
     "p0_completion": "3/3 (100%)",
     "p1_completion": "4/4 (100%)",