docs(legal): document DeadlineGuard fail-closed behavior

[mintlify]

Summary

Updates legal/guards.mdx to reflect the fail-closed change in DeadlineGuard from qwed-ai/qwed-legal#24.

Changes

• Updated the Response fields table:
  • computed_deadline is now Optional[datetime] (returns None for ambiguous terms)
  • difference_days is now Optional[int] (returns None for ambiguous terms)
  • verified clarified to be False when the term is ambiguous
  • Added new field is_computable: bool
• Added a Fail-closed on ambiguity row to the Features table.
• Added a new Fail-closed behavior on ambiguous terms section that documents:
  • The two gates that trigger fail-closed (no numeric quantity, or no recognizable time unit)
  • The exact field values returned in the unverifiable case
  • A code example using "within a reasonable period"
  • Recommended branching on is_computable before trusting computed_deadline
  • The recognized time-unit keywords (day/calendar, week, month, year)

Scope is limited to documenting changes explicitly introduced by the source PR.

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Project	Status	Preview	Updated (UTC)
qwed-ai	🟢 Ready	View Preview	May 10, 2026, 1:38 PM

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