fix: separate Anthropic OAuth tokens from API keys

Persist OAuth/setup tokens in ANTHROPIC_TOKEN instead of ANTHROPIC_API_KEY.
Reserve ANTHROPIC_API_KEY for regular Console API keys.

Changes:
- anthropic_adapter: reorder resolve_anthropic_token() priority —
  ANTHROPIC_TOKEN first, ANTHROPIC_API_KEY as legacy fallback
- config: add save_anthropic_oauth_token() / save_anthropic_api_key() helpers
  that clear the opposing slot to prevent priority conflicts
- config: show_config() prefers ANTHROPIC_TOKEN for display
- setup: OAuth login and pasted setup-tokens write to ANTHROPIC_TOKEN
- setup: API key entry writes to ANTHROPIC_API_KEY and clears ANTHROPIC_TOKEN
- main: same fixes in _run_anthropic_oauth_flow() and _model_flow_anthropic()
- main: _has_any_provider_configured() checks ANTHROPIC_TOKEN
- doctor: use _is_oauth_token() for correct auth method validation
- runtime_provider: updated error message
- run_agent: simplified client init to use resolve_anthropic_token()
- run_agent: updated 401 troubleshooting messages
- status: prefer ANTHROPIC_TOKEN in status display
- tests: updated priority test, added persistence helper tests

Cherry-picked from PR #1141 by kshitijk4poor, rebased onto current main
with unrelated changes (web_policy config, blocklist CLI) removed.

Co-authored-by: kshitijk4poor <kshitijk4poor@users.noreply.github.com>

tests/test_anthropic_adapter.py

@@ -133,9 +133,16 @@ class TestIsClaudeCodeTokenValid:
 
 
 class TestResolveAnthropicToken:
-    def test_prefers_api_key(self, monkeypatch):
+    def test_prefers_oauth_token_over_api_key(self, monkeypatch):
         monkeypatch.setenv("ANTHROPIC_API_KEY", "sk-ant-api03-mykey")
         monkeypatch.setenv("ANTHROPIC_TOKEN", "sk-ant-oat01-mytoken")
+        assert resolve_anthropic_token() == "sk-ant-oat01-mytoken"
+
+    def test_falls_back_to_api_key_when_no_oauth_sources_exist(self, monkeypatch, tmp_path):
+        monkeypatch.setenv("ANTHROPIC_API_KEY", "sk-ant-api03-mykey")
+        monkeypatch.delenv("ANTHROPIC_TOKEN", raising=False)
+        monkeypatch.delenv("CLAUDE_CODE_OAUTH_TOKEN", raising=False)
+        monkeypatch.setattr("agent.anthropic_adapter.Path.home", lambda: tmp_path)
         assert resolve_anthropic_token() == "sk-ant-api03-mykey"
 
     def test_falls_back_to_token(self, monkeypatch):

tests/test_anthropic_provider_persistence.py

@@ -0,0 +1,31 @@
+"""Tests for Anthropic credential persistence helpers."""
+
+from hermes_cli.config import load_env
+
+
+def test_save_anthropic_oauth_token_uses_token_slot_and_clears_api_key(tmp_path, monkeypatch):
+    home = tmp_path / "hermes"
+    home.mkdir()
+    monkeypatch.setenv("HERMES_HOME", str(home))
+
+    from hermes_cli.config import save_anthropic_oauth_token
+
+    save_anthropic_oauth_token("sk-ant-oat01-test-token")
+
+    env_vars = load_env()
+    assert env_vars["ANTHROPIC_TOKEN"] == "sk-ant-oat01-test-token"
+    assert env_vars["ANTHROPIC_API_KEY"] == ""
+
+
+def test_save_anthropic_api_key_uses_api_key_slot_and_clears_token(tmp_path, monkeypatch):
+    home = tmp_path / "hermes"
+    home.mkdir()
+    monkeypatch.setenv("HERMES_HOME", str(home))
+
+    from hermes_cli.config import save_anthropic_api_key
+
+    save_anthropic_api_key("sk-ant-api03-test-key")
+
+    env_vars = load_env()
+    assert env_vars["ANTHROPIC_API_KEY"] == "sk-ant-api03-test-key"
+    assert env_vars["ANTHROPIC_TOKEN"] == ""