📝 Scribe: Add XML documentation for Housing Remote Agents

[nt153133]

This PR illuminates the housing-related remote agents by adding detailed XML documentation.

What

• AgentHousingSignboard: Documented plot metadata including ward, plot, sale status, and size. Added specific <remarks> explaining that WinningLotteryNumber and LotteryEntryCount currently use swapped offsets from the underlying memory mappings.
• AgentHousingSelectBlock: Documented ward selection logic and plot status reading, clarifying that the ward index is zero-based in this context.
• AgentHousing: Added high-level summary for the base housing agent.

Why

These agents interface directly with game memory and contain non-obvious domain logic, such as the 1-based indexing for plots/wards and the intentional offset swap in the lottery properties. Providing this clarity ensures future maintainers understand the "what" and "why" behind the implementation.

Examples

/// <summary>
/// Gets the 1-based ward number of the plot.
/// </summary>
public byte Ward => (byte)(Core.Memory.Read<byte>(Pointer + AgentHousingSignBoardOffsets.Ward) + 1);

/// <summary>
/// Gets the number of the winning ticket for the most recent lottery on this plot.
/// </summary>
/// <remarks>
/// Note: This property currently utilizes the offset named <c>LotteryEntryCount</c> (with an adjustment) from the offset manager.
/// </remarks>
public ushort WinningLotteryNumber => Core.Memory.Read<ushort>(Pointer + AgentHousingSignBoardOffsets.LotteryEntryCount + 0xC);

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PR created automatically by Jules for task 17268433237527074644 started by @nt153133

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