Add Assurance subject/exactness model for IDE type narrowing#28
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This was referenced Jun 26, 2026
Extend the #[Assurance] vocabulary so consumers (FluentGen, FluentAnalysis) can derive how a composable prefix transforms the wrapped node's assured type: - Add #[AssuranceSubject] with AssuranceSubjectMode (Wrap / Elements / Container) describing whether a prefix wraps, iterates, or derives the subject. - Add the `exact` flag to #[Assurance]; remove AssuranceModifier::Nullable, now expressed as AssuranceSubject(Wrap) + type: 'null'. This is a BC break (3.0). - Add AssuranceFrom::TypeString (an instance of the class named by a class-string argument). #[AssuranceParameter] is now purely argument indexing (any position, default first); `from` selects the derivation, decoupled from class-string-ness. - Thread a TExact template through the fluent builders for analyzer state. - Correct the README composition claim: prefix resolution is single-level.
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Part of a PR group: Fluent - FluentGen - Validation
Extend the #[Assurance] vocabulary so consumers (FluentGen, FluentAnalysis) can derive how a composable prefix transforms the wrapped node's assured type:
exactflag to #[Assurance]; remove AssuranceModifier::Nullable, now expressed as AssuranceSubject(Wrap) + type: 'null'. This is a BC break (3.0).