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On session resume, turns/inputTokens/outputTokens were cumulative (entire session history) instead of per-step increments. Now we snapshot metrics before prompt, compare after, and report the delta. Changes: - acp-client: add getSessionId() accessor - hermes: extract snapshotUsage() + computeUsageDelta() pure functions - hermes: runPrompt/runHermes/continueHermes use before/after snapshots - 9 new unit tests for usage delta computation Refs #68