perf: cache winget list to avoid per-app subprocess calls

[Copilot]

install/winget.ps1 was calling winget list --id <id> -e inside the loop for every app in wingetfile.json, making setup time linear in app count due to repeated subprocess overhead.

• Cache installed apps: Call winget list --output json once before the loop, parse JSON, and build a hashtable of installed package IDs for O(1) lookup
• In-memory lookup: Replace per-iteration winget list --id with $installedAppIds.ContainsKey() against the cached hashtable, ensuring exact ID matching without regex false positives
• README: Clarify install/wingetfile.json path

# Before: O(n) winget invocations
foreach ($app in $json.apps) {
    $check = winget list --id $app.Id -e 2>$null
    if ($LASTEXITCODE -eq 0 -and $check -match [regex]::Escape($app.Id)) { continue }
}

# After: 1 winget invocation + O(n) hashtable lookups
$installedAppIds = @{}
$installedAppsOutput = winget list --output json 2>$null
if ($LASTEXITCODE -eq 0 -and $installedAppsOutput) {
    $installedAppsJson = $installedAppsOutput | Out-String
    $installedApps = $installedAppsJson | ConvertFrom-Json
    foreach ($pkg in $installedApps) { $installedAppIds[$pkg.Id] = $true }
}

foreach ($app in $json.apps) {
    if ($installedAppIds.ContainsKey($app.Id)) { continue }
}

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[Copilot]

Pull request overview

Scoop と同様に、Winget アプリを install/wingetfile.json で宣言的に管理し、setup.ps1 の導入処理と pwsh/sync.ps1 の自動同期フローに組み込む PR。

Changes:

• install/wingetfile.json を追加し、Winget アプリの宣言的リストを導入
• install/winget.ps1 を追加し、未導入アプリのみを winget install で導入
• pwsh/sync.ps1 に winget export ベースの wingetfile 自動同期を追加（winget ソースのみ）

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
setup.ps1	セットアップ中に install/winget.ps1 を実行して winget アプリ導入を統合
pwsh/sync.ps1	winget export から install/wingetfile.json を自動生成・更新する同期処理を追加
install/wingetfile.json	Winget 管理対象アプリの宣言ファイルを新規追加
install/winget.ps1	wingetfile.json を読み、未インストール分のみ導入するインストーラを新規追加
README.md	Winget アプリが wingetfile から自動導入される旨を追記

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[Copilot]

Pull request overview

Adds Winget-based app installation to the dotfiles bootstrap flow and improves performance by avoiding repeated WinGet subprocess calls during install checks, while also introducing a Wingetfile sync mechanism.

Changes:

• Invoke a new install/winget.ps1 from setup.ps1 to install apps listed in install/wingetfile.json.
• Add Winget export-based synchronization to regenerate install/wingetfile.json from installed Winget-source packages.
• Update README to document Wingetfile-driven installs.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
setup.ps1	Calls the new Winget installer script during setup and logs the step.
pwsh/sync.ps1	Adds winget export-based generation of install/wingetfile.json.
install/wingetfile.json	Introduces declarative Winget app list (initial entry).
install/winget.ps1	Implements Winget install loop with a cached installed-apps check.
README.md	Documents that Winget apps are installed from install/wingetfile.json.

---

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[Copilot]

Pull request overview

This PR improves the dotfiles bootstrap/setup pipeline by adding Winget-based app installation (driven by install/wingetfile.json) and by avoiding per-app winget list subprocess calls via a cached installed-apps lookup.

Changes:

• Add install/winget.ps1 and install/wingetfile.json to install Winget apps during setup.ps1.
• Extend pwsh/sync.ps1 to auto-generate/sync install/wingetfile.json from winget export (winget source only).
• Update README to document Winget app installation via wingetfile.json.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
setup.ps1	Runs the new Winget install step as part of setup.
pwsh/sync.ps1	Adds best-effort sync of install/wingetfile.json using winget export.
install/wingetfile.json	Introduces the Winget app manifest (initial app list).
install/winget.ps1	Installs Winget apps and caches installed apps to reduce subprocess overhead.
README.md	Documents that Winget apps are installed from install/wingetfile.json.

---

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[ycookiey]

@copilot apply changes based on this feedback

[Copilot]

Updated the PR description to accurately reflect the implementation: winget list --output json → JSON parse → hashtable lookup ($installedAppIds.ContainsKey()), not regex matching.