docs(plans): mark credential-system-v2 completed

docs/plans/state.json

@@ -13,10 +13,34 @@
     },
     "credential-system-v2-api-and-oauth": {
       "file": "2026-02-15-credential-system-v2-api-and-oauth-checklist.md",
-      "status": "planned",
+      "status": "completed",
       "date": "2026-02-15",
       "updated": "2026-02-15",
-      "summary": "Executable PR-sized checklist to implement per-tier auth_mode with both API-key and OAuth/token credential sources, adding OpenAI API-key storage, Anthropic auth-token storage, CLI/TUI login UX, model factory enforcement, and doctor reporting."
+      "summary": "Implemented per-tier auth_mode (auto/api_key/oauth) with deterministic credential resolution (config/env/store), added OpenAI API-key storage and Anthropic auth-token storage to auth.json, extended CLI + TUI login UX, enforced auth_mode in the model factory, and improved doctor output to show credential availability without leaking secrets.",
+      "files_created": [
+        "src/cli/openai-key.ts"
+      ],
+      "files_modified": [
+        "src/config/schema.ts",
+        "src/config/schema.test.ts",
+        "README.md",
+        "config/default.yaml",
+        "src/auth/openai.ts",
+        "src/auth/openai.test.ts",
+        "src/auth/anthropic.ts",
+        "src/auth/anthropic.test.ts",
+        "src/auth/index.ts",
+        "src/cli/anthropic-auth.ts",
+        "src/cli/index.ts",
+        "src/cli/index.test.ts",
+        "src/frontends/tui/minimal.ts",
+        "src/frontends/tui/commands.ts",
+        "src/daemon/models.ts",
+        "src/daemon/clientFactory.test.ts",
+        "src/cli/doctor.ts",
+        "src/cli/doctor.test.ts"
+      ],
+      "test_status": "pnpm typecheck + pnpm test:run (targeted suites + full passing locally)"
     },
     "vercel-ai-gateway-provider": {
       "file": "2026-02-15-vercel-ai-gateway-provider-checklist.md",