Add Vector.Direction node for cardinal direction conversion

[Copilot]

Implements a Vector.Direction node that converts Dynamo vectors to cardinal directions (N, S, E, W, NE, NW, SE, SW), paralleling the existing Walls.Direction functionality for general-purpose vectors.

Implementation

• Location: src/RhythmCore/Geometry/Vector.cs
• Algorithm: Calculates angles to cardinal directions via dot product, applies same thresholds as Walls.Direction (π/4 primary, π/3 intercardinal)
• Edge cases: Returns empty string for zero/near-zero magnitude vectors
• Performance: Static readonly cardinal vectors, pre-calculated magnitudes, single magnitude computation per call

Usage

var direction = Rhythm.Geometry.Vector.Direction(myVector);
// Returns: "N", "NE", "E", "SE", "S", "SW", "W", "NW", or ""

Technical Notes

• Uses SystemMath alias to avoid namespace collision with Rhythm.System
• Node categorized under "Query" with search tags: vector, direction, cardinal, NSEW

Original prompt

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This section details on the original issue you should resolve

<issue_title>Vector.Direction</issue_title>
<issue_description>What is the problem that needs solving?
Node to turn a vector into cardinal direction, NSEW etc.

How would you like to see it solved?
New node based on walls.direction logic

Describe alternatives you've considered
I've done this before with OOTB nodes.

Additional context

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Vector.Direction #34

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