chore(release): prepare S1API 3.2.1-beta.4

[ifBars]

Release

Prepare S1API 3.2.1-beta.4 from the merged f6 NPC compatibility fix in #311. Bump both version fields and add curated prerelease notes.

Validation

• MonoMelon build and 723 contract tests passed.
• Il2CppMelon build and 709 contract tests passed.
• PR fix: support plain custom NPCs on f6 beta #311 passed live 0.4.7f6 Mono and IL2CPP save-load smoke for both plain NPC contact paths.
• After publishing, the GitHub release archive will be downloaded and tested again on both f6 installs.

Compatibility

No public or protected API signatures, save identifiers, or network formats change. This release only makes the f6 native event change compatible while retaining old-build initialization where the member exists.

This replaces #312 with the same commit. The previous branch name triggered a push documentation job against stable assemblies, which failed despite the beta PR check passing. The release/ branch is excluded from that push workflow; this PR runs the required beta-assembly check.

Follow-up for #309.

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