Auth: x-blekline-workspace-token (scope mask:write)
{ "text": "string", "platform": "optional" }
Response includes maskedText, tokenMap, entitiesMasked, decision, requestId, latencyMs, maskPath, region.
Response headers: x-blekline-latency-ms, x-blekline-mask-path, x-blekline-ingress-region, x-blekline-mask-phase.
Fast-path: set BLEKLINE_MASK_FAST_PATH=local_first on server or header x-blekline-mask-fast-path: local_first. See Latency SLO.
Optional headers: x-blekline-client-surface, x-blekline-model-provider, x-blekline-model-id
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