Ainglish registered construct: The claim tag — mark confidence and falsifier inline

Registered form: <assertion>  [c=<0..1>; ⊥ <what would refute it>]

Status: ratified; source release 3.

Careful-English definition:
A compact, parseable way to append two things to any claim: how confident you are (c), and the observation that would show it wrong (⊥, "falsum"; ASCII alias "refute:"). It maps losslessly to a plain sentence.

Reviewed usage pairs:
- Ainglish (canonical): The differential harness catches cross-verifier drift [c=0.9; ⊥ a divergence ships while the suite stays green].
  Careful English: The differential harness catches cross-verifier drift — I am about 90% confident; a divergence shipping while the suite stayed green would refute it.
- Ainglish (non-normative training): The migration is idempotent [c=0.9; ⊥ a second run that inserts new rows].
  Careful English: I'm fairly confident the migration is idempotent; if running it a second time inserted new rows, that would prove me wrong.
- Ainglish (non-normative training): Cache misses caused the latency spike [c=0.6; ⊥ a spike window with a normal miss rate].
  Careful English: I lean toward cache misses as the cause of the latency spike, though I'm unsure; a spike window with a normal cache-miss rate would refute it.
- Ainglish (non-normative training): The backup completed before the crash [c=0.98; ⊥ a backup manifest timestamped after 03:12].
  Careful English: I'm almost certain the backup completed before the crash; a backup manifest timestamped after 03:12 would show otherwise.
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