fix(agent): normalize socks:// env proxies for httpx/anthropic

WSL2 / Clash-style setups often export ALL_PROXY=socks://127.0.0.1:PORT. httpx and the Anthropic SDK reject that alias and expect socks5://, so agent startup failed early with "Unknown scheme for proxy URL" before any provider request could proceed.

Add shared normalize_proxy_url()/normalize_proxy_env_vars() helpers in utils.py and route all proxy entry points through them:
  - run_agent._get_proxy_from_env
  - agent.auxiliary_client._validate_proxy_env_urls
  - agent.anthropic_adapter.build_anthropic_client
  - gateway.platforms.base.resolve_proxy_url

Regression coverage:
  - run_agent proxy env resolution
  - auxiliary proxy env normalization
  - gateway proxy URL resolution

Verified with:
PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 /home/nonlinear/.hermes/hermes-agent/venv/bin/pytest -o addopts='' -p pytest_asyncio.plugin tests/run_agent/test_create_openai_client_proxy_env.py tests/agent/test_proxy_and_url_validation.py tests/gateway/test_proxy_mode.py

39 passed.

utils.py

@@ -197,6 +197,39 @@ def env_bool(key: str, default: bool = False) -> bool:
     return is_truthy_value(os.getenv(key, ""), default=default)
 
 
+# ─── Proxy Helpers ────────────────────────────────────────────────────────────
+
+
+_PROXY_ENV_KEYS = (
+    "HTTPS_PROXY", "HTTP_PROXY", "ALL_PROXY",
+    "https_proxy", "http_proxy", "all_proxy",
+)
+
+
+def normalize_proxy_url(proxy_url: str | None) -> str | None:
+    """Normalize proxy URLs for httpx/aiohttp compatibility.
+
+    WSL/Clash-style environments often export SOCKS proxies as
+    ``socks://127.0.0.1:PORT``. httpx rejects that alias and expects the
+    explicit ``socks5://`` scheme instead.
+    """
+    candidate = str(proxy_url or "").strip()
+    if not candidate:
+        return None
+    if candidate.lower().startswith("socks://"):
+        return f"socks5://{candidate[len('socks://'):]}"
+    return candidate
+
+
+def normalize_proxy_env_vars() -> None:
+    """Rewrite supported proxy env vars to canonical URL forms in-place."""
+    for key in _PROXY_ENV_KEYS:
+        value = os.getenv(key, "")
+        normalized = normalize_proxy_url(value)
+        if normalized and normalized != value:
+            os.environ[key] = normalized
+
+
 # ─── URL Parsing Helpers ──────────────────────────────────────────────────────
 
 
@@ -236,4 +269,3 @@ def base_url_host_matches(base_url: str, domain: str) -> bool:
     if not domain:
         return False
     return hostname == domain or hostname.endswith("." + domain)
-