Preserve SDK usage reporting and interrupted Codex usage

[miguelg719]

Distinguishes unreported usage from observed zero across SDK boundaries and recovers interrupted Codex usage without replacing authoritative completed-turn counts. Eval accounting consumes this metadata in the later adoption PR.

Validation: 167 SDK tests, 38 Python tests, 12 build tasks, and SDK/core/eval typechecks passed. Authoritative completed Codex usage takes precedence over interrupted-rollout recovery.

Stack position: 10/17. Base: evals/consolidation-09-event-retention. Each PR contains the change relative to its immediate predecessor.

Reviewer entry points:

• packages/integrations/codex-sdk/src/session.ts
• packages/integrations/deepagents/runner/run_eval.py
• packages/integrations/mastra-sdk/src/session.ts

Readiness: local validation is described above; GitHub CI and automated review feedback are pending. This PR is open as non-draft so automated reviewers can run.

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Latest commit: feffa57

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[cubic-dev-ai]

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