Fix cygpath output handling for MSYS2 environments

[Copilot]

Fix for cygpath newline issue on MSYS2

• Squashed all commits into single commit
• Fixed commit message to follow conventional commit format
• Strip trailing newline/carriage return from cygpath output
• Added nil guard for edge cases
• Formatting verified with make format-check

Summary

Fixed Gitsigns attachment failure on MSYS2 by stripping trailing newlines/carriage returns from cygpath command output in lua/gitsigns/util.lua.

Single commit follows conventional commit format: fix: strip trailing newlines from cygpath output on MSYS2

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Gitsigns fails to attach in msys2</issue_title>
<issue_description>### Description

The debug messages showed that extra '\n' are present in git commands.

This fixes. Please apply or do similar newline striping!

diff --git a/lua/gitsigns/git/repo.lua b/lua/gitsigns/git/repo.lua
index 3ed6196..cdad8cb 100644
--- a/lua/gitsigns/git/repo.lua
+++ b/lua/gitsigns/git/repo.lua
@@ -168,6 +168,9 @@ local function normalize_path(path)
     -- through cygpath
     --- @type string
     path = async.await(3, system, { 'cygpath', '-aw', path }).stdout
+    if path:sub(-1) == '\n' then
+      path = path:sub(1, -2)
+    end
   end
   return path
 end

Neovim version

Not relevant

Operating system and version

Windows 11

Expected behavior

No response

Actual behavior

Gitsigns failed to attach

Minimal config

for name, url in pairs{
  gitsigns = 'https://github.com/lewis6991/gitsigns.nvim',
  -- ADD OTHER PLUGINS _NECESSARY_ TO REPRODUCE THE ISSUE
} do
  local install_path = vim.fn.fnamemodify('gitsigns_issue/'..name, ':p')
  if vim.fn.isdirectory(install_path) == 0 then
    vim.fn.system { 'git', 'clone', '--depth=1', url, install_path }
  end
  vim.opt.runtimepath:append(install_path)
end

require('gitsigns').setup{
  debug_mode = true, -- You must add this to enable debug messages
  -- ADD GITSIGNS CONFIG THAT IS _NECESSARY_ FOR REPRODUCING THE ISSUE
}

-- ADD INIT.LUA SETTINGS THAT IS _NECESSARY_ FOR REPRODUCING THE ISSUE

Steps to reproduce

Run nvim in MSYS2

Gitsigns debug messages

Gitsigns cache

```</issue_description>

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

<comments>
</comments>

• Fixes Gitsigns fails to attach in msys2 #1349

---

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[lewis6991]

@copilot squash commits and fix commit_lint

[Copilot]

@copilot squash commits and fix commit_lint

Squashed the 5 commits into a single commit with conventional commit format at 007be54:

fix: strip trailing newlines from cygpath output on MSYS2

The commit is ready locally but requires a force push to replace the history on the remote branch (currently diverged with 1 local vs 5 remote commits). The squashed commit follows the conventional commit format and will pass commit_lint.