docs(abstraction): clarify Registerable and Saveable usage

[ifBars]

Linked issue

Refs #343

Contributor checklist

• I linked an issue opened before this PR.
• I checked existing issues and PRs for duplicate or overlapping work.
• This PR addresses one focused problem or request.

Summary

Clarify the intended use of the existing public abstraction classes:

• Registerable is public because public API classes inherit it. Modders should use the appropriate API base class rather than inherit this infrastructure class directly.
• Saveable is a supported modder-facing persistence base despite its internal namespace. Its documentation now describes standalone save data, SaveableField, lifecycle callbacks, load timing, and inherited NPC/quest persistence support.

The final diff contains only XML comments in these two existing files.

Compatibility

• Public/protected API: No changes to types, namespaces, inheritance, accessibility, attributes, signatures, or virtual member shape.
• Existing defaults and behavior: Unchanged; executable source matches the beta baseline.
• Stable IDs, saves, and network payloads: Unchanged.
• Source and binary compatibility are unchanged. No namespace migration, deprecation, IntelliSense attributes, compatibility shim, or planned type removal is introduced.

Validation

Mono

dotnet restore S1API/S1API.csproj -p:Configuration=MonoMelon -p:AutomateLocalDeployment=false

dotnet build S1API/S1API.csproj -c MonoMelon --no-restore -p:AutomateLocalDeployment=false

Build passed with zero warnings/errors.

IL2CPP

Matching restore/build with Il2CppMelon passed with zero warnings/errors. Local deployment was disabled.

Runtime evidence

No gameplay smoke or contract-suite rerun was needed for the final documentation-only scope. Verified that every added/removed line against beta baseline beed831 is an XML comment. The diff against that baseline passes whitespace checks.

Documentation

Update the class summaries and remarks for S1API.Internal.Abstraction.Registerable and S1API.Internal.Abstraction.Saveable.

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