Second review pass on #835's diagnostics. Behaviour is unchanged.
- Report viewport_context.result as soon as the send returns, so a throw
in the retained-frame bookkeeping cannot log a real send as "error".
- List the decision reasons and when each field is present in
CURRENT-STATE, note that the rate limit can split a pair, and say which
codes are defensive.
- Changelog: the decision is logged when an entity-context answer reaches
the image step, not for every answer.
manjunath22466
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