feat: HTTP transport with KasFloodDelay gating and 5xx retry - #27
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Add internal/transport.Client for posting SOAP envelopes to a KAS endpoint: - HTTP POST with text/xml; charset=utf-8 and a version-stamped User-Agent. - Exponential backoff on 5xx and network errors, MaxRetries configurable; 4xx and SOAP-level faults are surfaced without retry. - Per-instance gate consulted before each request: callers report the delay returned by the server via RecordDelay so successive Do calls honour the KAS-side rate limit. - Now and Sleep are injectable so retry timing and gate behaviour are asserted via httptest.Server without real-clock waits. Closes #4.
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internal/transport.Client: HTTP POST against the KAS endpoint with a versioned User-Agent, exponential backoff on 5xx and network errors, and a per-client gate that honours the server-sideKasFloodDelay. Callers feed the delay back viaRecordDelayafter parsing each response.Now/Sleepare injectable so all retry and gate behaviour is asserted viahttptest.Serverwithout real-clock waits.Closes #4.