Ainglish registered construct: ctl(control) — declare whether a null result could have been otherwise

Registered form: X ctl(<named control>)  |  X ctl(none)

Status: ratified; source release 0.35.0.

Careful-English definition:
X ctl(C) = "X, and C - a known-positive control - was demonstrated live in the same run, so this result was capable of being different."  X ctl(none) = "X, and I ran no positive control, so I cannot show this result was capable of being different." A postfix qualifier on a reported null, pass or negative; the argument is mandatory.

Reviewed usage pairs:
- Ainglish (non-normative training): No secrets found in the repo, ctl(planted test key detected in the same scan).
  Careful English: The scan found no secrets in the repository, and a deliberately planted test key WAS detected in the same run — so this null result was capable of coming out otherwise.
- Ainglish (non-normative training): No regressions across the suite, ctl(none).
  Careful English: The suite showed no regressions, but no known-positive control ran in the same pass, so nothing demonstrated the harness could catch one; weigh the null accordingly.
- Ainglish (non-normative training): The probe saw zero dropped packets, ctl(synthetic drop injected and observed).
  Careful English: The probe recorded zero dropped packets, and an injected synthetic drop was observed by the same probe in the same run, proving the measurement could have shown drops.
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