nushell: add autoload scripts option

[gamemaster2b]

Description

Add a new 'programs.nushell.autoload' option for loading '.nu' files at startup from relative paths or inline content.

This options should used by other modules for their nushell intergrations.

I thought to add this upon seeing this is how devenv@2.2.x recommends intergrating with nushell

Checklist

• Change is backwards compatible.

• Code formatted with nix fmt or
  nix-shell -A dev --run treefmt.

• Code tested through nix run .#tests -- test-nushell.

• Test cases updated/added. See example.

• Commit messages are formatted like

  {component}: {description}
  
  {long description}
  

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• If this PR adds a new module

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  • Basic tests added. See Tests

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[Copilot]

Pull request overview

Adds a new Home Manager option to support Nushell autoload scripts, allowing users to include .nu files at startup either by referencing relative paths or by providing inline script content.

Changes:

• Introduces programs.nushell.autoload as a list accepting either relative .nu paths or { name, content } script objects.
• Extends home.file generation to populate ${cfg.configDir}/autoload/ with the configured scripts.

Comments suppressed due to low confidence (1)

modules/programs/nushell.nix:372

• The assert expression is syntactically invalid in Nix (assert <cond>; <expr>), so this module will fail to evaluate. Also, reading the script files with builtins.readFile contradicts the option doc claiming symlinking, and forces evaluation-time reads that can be avoided by using home.file.<name>.source for path inputs.

          assert (
            builtins.match ".*\\.nu$" (toString fileName) != null
          ) "ensure the file name has the extension '.nu'; your current file name is ${fileName}";
          {
            "${cfg.configDir}/autoload/${fileName}".text = content;

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