James Eversole e595763f91 Attach contracts to definitions ...

Contracts now live directly on definitions via @ / =@ annotations and
travel automatically with exported values.

- Remove !export from lexer/parser/AST/evaluator/manifest/resolver and CLI.
- Simplify workspace module export logic: export all top-level local
  definitions by default.
- Update Frontend.ContractDesugar:
  - Named binder annotations (x@nat?) expand to per-argument withContract.
  - Phantom annotations (@nat?) expand to a local raw helper plus a wrapper,
    keeping fixed points shared and only depending on withContract.
- Merge lib/guardedBase.tri into lib/base.tri and annotate partial/sensitive
  base functions: head, tail, last, add, sub, mul, div, mod, pow, min,
  max, length, sum, product.
- Add check contract helper to lib/base.tri.
- Update demos/contractBasics.tri and README to reflect @/=@-only design.
- Update test suite: remove guardedBase import, replace explicit !export
  test with a test verifying that contract annotations on an exported
  definition are enforced on import.
- Fix remaining base.tri definitions (div/mod/pow) to stay point-free.

2026-09-01 12:08:40 -05:00

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