State compliance with SP3.0 and SP3.1

[cforgaci]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the package documentation to state compliance with spatial statistics standards SP3.0 and SP3.1. The changes clarify that the package does use spatial neighbors through the get_cost_distance() function, which leverages terra::costDist() for cost distance calculations with slope-weighted neighbor contributions.

• Updates documentation tags from "not applicable" to "compliant" for SP3.0 and SP3.1 standards
• Adds detailed explanation of how spatial neighbors are handled via terra::costDist()
• Maintains "not applicable" status for SP3.0b (irregular spaces) while providing clearer rationale

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
R/valley.R	Adds SP3.1 compliance documentation to get_cost_distance() function
R/srr-stats-standards.R	Updates SP3.0/SP3.1 status from NA to compliant with detailed explanations

Comments suppressed due to low confidence (1)

R/srr-stats-standards.R:115

• The function name in the comment get_cost_dist() does not match the actual function name get_cost_distance() used in the code.

#' @srrstatsNA {SP3.0, SP3.0a} The `get_cost_dist()` internal function uses

[fnattino]

I think for this one we should refer to smooth_dem(), where we apply a spatial median filter using a square ("queen") neighborhood form.