fix(windows): hide the git calls that flash console windows (#2094) (#2280)

* fix(windows): hide the git calls that flash console windows (#2094)

The two git calls added for exclude-standard scope parity (#1728),
`git config --get core.excludesFile` and
`git ls-files -o -i --exclude-standard --directory`, ran without
windowsHide. Inside the detached, console-less MCP daemon each one got a
fresh visible console, so a window flashed several times on daemon start
and again on every auto-sync. With Windows Terminal as the default
terminal each flash is a full Windows Terminal window. `git config
user.name` in the viewer's trails API had the same gap.

Add windowsHide: true to all three, and replace the per-file regex guards
with an AST guard over every child_process spawn in src/: options passed
through a variable or a function parameter are traced back to the object
literal that defines them, through every call site.

Supersedes #2095 (same fix, rebased on current main). Closes #2094,
closes #2096.

(cherry picked from commit dd2db41f1b)

* docs(changelog): credit the Windows console-window fix

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
(cherry picked from commit cf93d497fd1b38fd9214945eeb55b6b0be9e2007)

---------

Co-authored-by: Suharaz <minesuhara@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

src/ui-server/api/trails.ts

@@ -458,6 +458,7 @@ function gitUserName(projectRoot: string): string | null {
       encoding: 'utf-8',
       timeout: 2_000,
       stdio: ['ignore', 'pipe', 'ignore'],
+      windowsHide: true,
     });
     const name = out.trim();
     return name === '' ? null : name.slice(0, 120);