build: ignore res for serena

[ctron]

Serena MCP fails to start up due to following symlinks and considering the res folder an infinite loop.

However, it seems the only possible way to have it ignore this folder is to add it to gitignore. So we add the folder itself, but ignore it's content. git does that anyway, but now also serena does it.

Summary by Sourcery

Build:

• Add a crate-level .gitignore entry to ignore contents of the res folder while keeping the directory itself tracked.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Introduces a crate-specific .gitignore to exclude the contents of the res directory from version control and Serena MCP’s filesystem traversal, while keeping the res directory itself present in the repository.

File-Level Changes

Change	Details	Files
Add crate-level ignore rules so Serena MCP and Git both skip the contents of the res directory but keep the directory itself.	Create a new .gitignore file scoped to the crate directory. Configure ignore patterns so that the res directory is tracked but its nested files and folders are ignored. Align Git ignore behavior with Serena MCP’s directory traversal to prevent startup failures caused by symlink loops in res.	crate/.gitignore

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.81%. Comparing base (2c1b241) to head (deb7e00).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #979      +/-   ##
==========================================
- Coverage   66.83%   66.81%   -0.03%     
==========================================
  Files         221      221              
  Lines        3881     3881              
  Branches      898      898              
==========================================
- Hits         2594     2593       -1     
- Misses        945      946       +1     
  Partials      342      342              

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