Prepare v0.15.0 release documentation

docs/roadmap/remediation.md

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-# Request Validation Review Findings
-
-Reviewed commits `f315620`, `f3148bf`, and `60784e7` against the finalized
-[feature roadmap](validate.md) and [implementation plan](implementation.md).
-
-## 1. Reuse The Existing Preparation-Parity Test Helper
-
-Priority: P3 (test maintainability). Status: complete.
-
-At reviewed commit `60784e7`, in
-[validate_request_contract_test.go](../../validate_request_contract_test.go),
-`TestValidateRequestMatchesPrepareContract` defines a local `testParity` closure
-at lines 25–45 that duplicates the package-level
-`assertValidateRequestParity` helper at lines 87–108. Both invoke `Prepare` and
-`ValidateRequest` and assert the same success/result and public-error behavior;
-the package-level helper additionally returns the successful prepared value.
-The nil-engine subtest repeats the same failure assertions again.
-
-Retaining separate copies makes future parity-assertion improvements require
-multiple edits and increases the risk that related tests diverge unnecessarily.
-This is a small cleanup, not a demonstrated functional or release-blocking bug.
-
-### Requested Remediation
-
-- Replace calls to the local closure with `assertValidateRequestParity` and
-  remove the redundant closure.
-- Reuse that helper for the nil-engine subtest as well; retain its
-  `ErrInvalidConfig` expectation.
-- Preserve all existing cases, public-error assertions, and no-model-call
-  checks. No production or public-contract changes are needed.
-
-Verify with `go test -race . -run '^TestValidateRequest'` and
-`git diff --check`, formatting the changed Go file.
-
-### Completion
-
-Removed the local closure and reused `assertValidateRequestParity` for all four
-cases, including the nil-engine `ErrInvalidConfig` expectation. Existing cases,
-public-error assertions, and no-model-call checks are preserved; production code
-and public contracts are unchanged.
-
-Formatted the Go file. The uncached, race-enabled `TestValidateRequest` tests
-and `git diff --check` passed.
-
-## Review Outcome
-
-The public method and shared facade helper match the intended architecture.
-No implementation gaps or unintended strengthening of contracts were found.
-The uncached full race-enabled suite, vet, maintained consumer examples, and
-implementation diff whitespace checks passed during review.