fix(#2163): review fixes — changeset format, explicit maxBuffer, hoisted require

- changeset reformatted to the bold-lead + (#2163) house convention
- explicit 8 MiB maxBuffer on the git spawn (default 1 MiB could overflow on
  huge dirty repos; overflow still degrades to segment-absent)
- child_process require hoisted to module level per file style

Claude-Session: https://claude.ai/code/session_01Hme55Pvq6BhpgwBcyC5HAg

.changeset/silly-moles-romp.md

@@ -2,4 +2,4 @@
 type: Added
 pr: 2183
 ---
-Opt-in git branch and working-state segment in the statusline (`statusline.show_git`): branch name plus staged/unstaged/untracked/ahead/behind markers, or ✓ when clean and in sync, rendered after the directory segment. Default off; when disabled no git subprocess is spawned and output is unchanged.
+**Opt-in git branch and working-state segment in the statusline** — the shell prompt's branch/dirty-state signal is hidden for the whole session under the Claude Code TUI, so wrong-branch commits and ship-time push rejections surface only after the fact. New `statusline.show_git` config (default `false`) renders the branch name plus staged/unstaged/untracked/ahead/behind markers (or ✓ when clean and in sync) after the directory segment. When disabled, no git subprocess is spawned and output is unchanged. (#2163)

hooks/gsd-statusline.js

@@ -6,6 +6,7 @@
 const fs = require('fs');
 const path = require('path');
 const os = require('os');
+const { execFileSync } = require('child_process');
 const { isSemverNewer } = require('../gsd-core/bin/lib/semver-compare.cjs');
 const { PACKAGE_NAME, updateCacheFileName } = require('../gsd-core/bin/lib/package-identity.cjs');
 
@@ -335,9 +336,11 @@ const GIT_STATUS_TIMEOUT_MS = 1500;
  */
 function readGitStatus(dir) {
   try {
-    const { execFileSync } = require('child_process');
+    // 8 MiB maxBuffer (default 1 MiB) headroom for repos with very many changed
+    // or untracked files; overflow still degrades safely to segment-absent via
+    // the catch below.
     return execFileSync('git', ['-C', dir, 'status', '--porcelain=v2', '--branch'],
-      { encoding: 'utf8', timeout: GIT_STATUS_TIMEOUT_MS, stdio: ['ignore', 'pipe', 'ignore'] });
+      { encoding: 'utf8', timeout: GIT_STATUS_TIMEOUT_MS, maxBuffer: 8 * 1024 * 1024, stdio: ['ignore', 'pipe', 'ignore'] });
   } catch (e) {
     return null;
   }