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Add rejectFoul option to activeSchema for server-side validation (#19)

* ✅ Add rejectFoul option to activeSchema for server-side guard

Enabled fields where `fair: false` (foul values) previously passed
through activeSchema with their base schema, silently accepting
contextually invalid input. With `rejectFoul: true`, those fields
receive a `.refine(() => false)` using the field's reason as the
message, so server handlers can reject submissions that contain
values that are structurally valid but contextually wrong.

Threads the option through createZodValidation as well.

https://claude.ai/code/session_01SMMXCxD2n1tDmMrtWRuBJj

* ✅ Add rejectFoul coverage for createZodValidation and add changeset

- Extends the validation.test.ts suite with a fairWhen-based scenario
  (gas vehicle in an electric spot) that exercises the rejectFoul path
  through createZodValidation.run(), including error message propagation
- Adds .changeset/zod-reject-foul.md for a minor bump to @umpire/zod

https://claude.ai/code/session_01SMMXCxD2n1tDmMrtWRuBJj

* 🐛 Fix rejectFoul for optional foul fields; fix fairWhen predicate; add coverage

- Foul optional fields now get .optional() so omitting the field passes
  while submitting the stale value is still rejected. Previously, absent
  foul optional fields failed with a generic "Required" error from the
  base schema rather than passing (Greptile P1).
- Add test: omitting a foul optional field passes when rejectFoul is true
  (Greptile P2).
- Fix fairWhen predicate in validation test: FairPredicate signature is
  (value, values, conditions), not (values); first arg is the field's own
  value, not the full values map.

https://claude.ai/code/session_01SMMXCxD2n1tDmMrtWRuBJj

* 📄 Add Validator Integrations docs; move Zod page to correct slug

- Add docs/integrations/validators.md — general page covering the
  validation integration contract (skip disabled, required/optional,
  rejectFoul), client vs server usage, and the pattern f... (continued)

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