feat(codegen): emit nullable.Value[T] when `nullable-type` is enabled

[frenchi]

Follow-on PR from https://github.com/oapi-codegen/nullable/pull/21.

Please do not merge this before nullable/pull/21 lands (tests won't pass anyway).

• Switch generator from deprecated nullable.Nullable[T] to output nullable.Value[T] for nullable fields
• Update schema tests to expect Value[T]
• Update README to prefer nullable.Value with migration notes
• Do not edit generated fixtures; regeneration will follow after library update

Before merging this PR, and after nullable/pull/21 lands:

• Bump github.com/oapi-codegen/nullable version to the release that includes Value[T]. go get github.com/oapi-codegen/nullable
• Run: go generate ./internal/test/issues/issue-1039 (and other fixtures) to re-emit nullable.Value[...].

[kusari-inspector[bot]]

Kusari Analysis Results:

✅ No Flagged Issues Detected All values appear to be within acceptable risk parameters.

Both dependency and code security analyses completed successfully with no critical security concerns identified. The new dependency github.com/oapi-codegen/[email protected] originates from the same organization, has no known vulnerabilities, uses a permissive license, and is at the latest version. While the dependency shows low maintenance activity, this represents a development practice concern rather than a security risk, especially given the organizational relationship. The code analysis found no security vulnerabilities, exposed secrets, or other security issues. The combined risk profile remains low with appropriate mitigations focused on ongoing monitoring rather than blocking deployment.

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Expand to see all dependency changes, security advisories, scorecard checks, etc.

Dependency Changes Introduced

Status	Package	Change	Version	Latest Version	Advisories	License
⚠️ Flagged	github.com/oapi-codegen/nullable	added	1.1.0	v1.1.0	None	Apache-2.0 (permissive)

Scorecard Checks

github.com/oapi-codegen/nullable:

• Maintained: 0/10 ⚠️ Repo is not maintained actively in the last 90 days.
• Code Review: 2/10 ⚠️ Project does not require human code review before all pull requests (aka merge requests) are merged.

Files where issues may be found

Dependency Files:

• go.mod

@kusari-inspector rerun - Trigger a re-analysis of this PR @kusari-inspector feedback [your message] - Send feedback to our AI and team See Kusari's documentation for setup and configuration. Commit: 56c9c136b97323fcbacb224c2faaf51a7c6e6d84, performed at: 2025-08-27T07:46:30Z

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