perf(startup): lazy-import OpenAI, Anthropic, Firecrawl, account_usage (#17046)

* perf(startup): lazy-import OpenAI, Anthropic, Firecrawl, account_usage

Four heavy SDK/module imports are now deferred off the hot startup path.
Net savings on cold module imports:

  cli                       1200 → 958 ms  (-242)
  run_agent                 1220 → 901 ms  (-319)
  tools.web_tools            711 → 423 ms  (-288)
  agent.anthropic_adapter    230 →  15 ms  (-215)
  agent.auxiliary_client     253 →  68 ms  (-185)

Four independent changes in one PR since they all use the same pattern
and share the same risk profile (heavy SDK import → lazy proxy or
function-local import):

1. tools/web_tools.py:
   'from firecrawl import Firecrawl' moved into _get_firecrawl_client(),
   which is only called when backend='firecrawl'. Users on Exa/Tavily/
   Parallel pay zero firecrawl cost.

2. cli.py + gateway/run.py:
   'from agent.account_usage import ...' moved into the /limits handlers.
   account_usage transitively pulls the OpenAI SDK chain; only needed
   when the user runs /limits.

3. agent/anthropic_adapter.py:
   'try: import anthropic as _anthropic_sdk' replaced with a cached
   '_get_anthropic_sdk()' accessor. The three usage sites
   (build_anthropic_client, build_anthropic_bedrock_client,
   read_claude_code_credentials_from_keychain) now resolve via the
   accessor. All pre-existing test patches of
   'agent.anthropic_adapter._anthropic_sdk' keep working because the
   accessor respects any value already in module globals.

4. agent/auxiliary_client.py AND run_agent.py:
   'from openai import OpenAI' replaced with an '_OpenAIProxy()' module-
   level object that looks like the OpenAI class but imports the SDK on
   first call/isinstance check. This preserves:
     - 15+ in-module OpenAI(...) construction sites in auxiliary_client
       and the single site in run_agent's _create_openai_client (Python's
       function-scope name lookup finds the proxy, forwards the call);
     - 'patch("agent.auxiliary_client.OpenAI", ...)' and
       'patch("run_agent.OpenAI", ...)' test patterns used by 28+ test
       files (patch replaces the module attribute as usual).
   Tried two alternatives first:
     - 'from openai._client import OpenAI' — doesn't skip openai/__init__.py
       (the audit's hypothesis here was wrong).
     - Module-level __getattr__ — works for external access but Python
       function-scope name resolution skips __getattr__, so in-module
       OpenAI(...) calls NameError.

Note: 'openai' still loads on 'import cli' because
cli.py -> neuter_async_httpx_del() -> openai._base_client, and
run_agent.py -> code_execution_tool.py (module-level
build_execute_code_schema) -> _load_config() -> 'from cli import
CLI_CONFIG'. Deferring those is a separate, larger change — out of scope
for this PR. The savings above all come from avoiding the openai/*,
anthropic/*, and firecrawl/* top-level type-tree imports on paths that
don't need them.

Verified:
- 302/302 tests in tests/agent/{test_anthropic_adapter,
  test_bedrock_1m_context, test_minimax_provider, test_anthropic_keychain}
  pass. Two pre-existing failures on main unchanged.
- 106/106 tests/agent/test_auxiliary_client.py pass (1 pre-existing fail).
- 97/97 tests/run_agent/test_create_openai_client_kwargs_isolation.py,
  test_plugin_context_engine_init.py, test_invalid_context_length_warning.py,
  test_api_max_retries_config.py,
  tests/hermes_cli/test_gemini_provider.py, test_ollama_cloud_provider.py
  pass (1 pre-existing fail).
- Live hermes chat smoke: 2 turns + /model switch + tool calls, zero
  errors in the 57-line agent.log window.
- Module-level import of run_agent + auxiliary_client + anthropic_adapter
  no longer pulls 'anthropic' or 'firecrawl' at all.

* fix(gateway): restore top-level account_usage import for test-patch surface

CI caught two failures in tests/gateway/test_usage_command.py that I
missed locally:

    AttributeError: 'module' object at gateway.run has no attribute 'fetch_account_usage'

The test uses monkeypatch.setattr('gateway.run.fetch_account_usage', ...)
to inject a fake account-fetch call. Moving the import inside the
handler deleted that module-level attribute, breaking the patch surface.

Restoring the top-level import in gateway/run.py gives up the ~230 ms
gateway-boot savings from that one lazy, but:

  1. the gateway is a long-running daemon — boot cost is paid once per
     install, not per turn;
  2. the other four lazy-imports (firecrawl, openai, anthropic, cli's
     account_usage) remain in place and still account for the bulk of
     the savings reported in the PR body;
  3. preserving the patch surface keeps the established
     'gateway.run.fetch_account_usage' monkeypatch pattern working
     without touching tests.

Verified: tests/gateway/test_usage_command.py — 8 passed, 0 failed.
Full targeted sweep (2336 tests across agent/gateway/hermes_cli/run_agent):
2332 passed, 4 failed — all 4 pre-existing on main.

---------

Co-authored-by: teknium1 <teknium@users.noreply.github.com>

cli.py

@@ -69,7 +69,9 @@ from agent.usage_pricing import (
     format_duration_compact,
     format_token_count_compact,
 )
-from agent.account_usage import fetch_account_usage, render_account_usage_lines
+# NOTE: `from agent.account_usage import ...` is deliberately NOT at module
+# top — it transitively pulls the OpenAI SDK chain (~230 ms cold) and is only
+# needed when the user runs `/limits`. Lazy-imported inside the handler below.
 from hermes_cli.banner import _format_context_length, format_banner_version_label
 
 _COMMAND_SPINNER_FRAMES = ("⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏")
@@ -7285,6 +7287,8 @@ class HermesCLI:
         provider = getattr(agent, "provider", None) or getattr(self, "provider", None)
         base_url = getattr(agent, "base_url", None) or getattr(self, "base_url", None)
         api_key = getattr(agent, "api_key", None) or getattr(self, "api_key", None)
+        # Lazy import — pulls the OpenAI SDK chain, only needed here.
+        from agent.account_usage import fetch_account_usage, render_account_usage_lines
         account_snapshot = None
         if provider:
             with concurrent.futures.ThreadPoolExecutor(max_workers=1) as _pool: