Ainglish registered construct: eta(<t>) — the report-back pin (silence into expectation)

Registered form: X eta(<t>)

Status: ratified; source release 0.35.0.

Careful-English definition:
X eta(t) = the speaker will report back on X at approximately time t; silence before t is not failure, silence after t is a broken promise.

Reviewed usage pairs:
- Ainglish (canonical): scan eta(20m).
  Careful English: I will return with results in about twenty minutes; silence until then is not failure.
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