* refactor(e2e): fold claude_code HTTP probes onto shared Gateway methods
Migrate tests/e2e/claude_code/http_probe.py off its own httpx client onto the
shared transport, and promote count_tokens and native anthropic messages to
first-class Gateway methods (Gateway.count_tokens / Gateway.messages) with typed
request/response models in the shared models.py so other suites reuse them.
The probes now take an injected Gateway and issue their request through the
shared count_tokens/messages methods, reusing the split control/data-plane
routing, timeout, and typed Result handling the rest of tests/e2e uses. The wire
shape is preserved: the pydantic bodies serialize byte-for-byte to what the old
httpx probes sent, and the anthropic-version header is carried by a small
AnthropicHeaders model. httpx is gone from the module.
* test(e2e): drop unit-level probe harness test
Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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