Felicia Chen f0c30e528a
Derive report prompt hashes from persisted rollouts ( #36271 ) ...
## Why
Report prompt metadata should reflect the persisted rollout instead of
unverified tags supplied by the client.
## What changed
- Hash the session's base instructions with SHA-256 after normalizing
whitespace, and add the result to report uploads as `prompt_hash`.
- Treat `prompt_hash` and `prompt_version` as reserved tags: remove
client-provided values and only restore `prompt_hash` when it can be derived
from the rollout.
- Collect the prompt hash alongside the selected turn's model and reasoning
effort metadata.
## Testing
Added unit tests for prompt normalization, rollout metadata selection, and
replacement or removal of client-provided prompt tags.
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