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StaticEmbeddingsPipeline now emits a `metrics` object on its run result with a `runTimestamps` timeline (initializationStart/End, runStart/End) plus scalar fields tailored to embeddings: inputChars, inputTokens, inferenceTime, tokensPerSecond, charsPerSecond. The shape mirrors the LlamaCppPipeline change from bug 2005365, adapted for embeddings: there is no decode stage or time-to-first-token, but character throughput is added since embeddings are commonly fed raw user text where character counts matter alongside token counts. The `metrics` field on EmbeddingResponse was previously typed as an array and emitted as []; no downstream consumer read it. That contract is replaced by the new EmbeddingMetrics interface in StaticEmbeddingsPipeline.d.ts. Adds a regression-guarding assertion in browser_ml_static_embeddings.js covering the metrics shape, the four runTimestamps names, and that inputChars/inputTokens/inferenceTime have sensible values. Differential Revision: https://phabricator.services.mozilla.com/D305384