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8307eadda2
Move header lowercasing from the per-request start() path to config time: - Python codegen now lowercases collect_headers values before passing to C++ - add_collect_header() stores values as-is (already lowered by Python) - start() with std::vector is now a direct passthrough to perform() - Deprecated std::set overload still lowercases for external callers Rename collect_headers_ to lower_case_collect_headers_ and update all parameter names throughout the chain to make the lowercase invariant explicit in the API contract. This eliminates per-request allocation of a temporary vector and str_lower_case() calls on every HTTP request, reducing stack usage in the perform() call chain where stack space is critical for HTTPS TLS handshakes.
