feat: add Linux and Windows named-window routing

• 06d7f2b52b fix: route Linux bridge replies to live sender webview glennmichael123 review this step
• 0c310e82c8 fix: forget Linux windows on native destroy glennmichael123 review this step
• a02b082b02 fix: scope Windows WebView2 lifecycle to each window glennmichael123 review this step
• eeb0e4ed59 fix: post injected bridge messages through WebView2 glennmichael123 review this step
• bf68015802 fix: install desktop bridge before first navigation glennmichael123 review this step
• 4a8869aefb feat: receive and route Linux window bridge messages glennmichael123 review this step
• fa5dd5267b feat: route Windows WebView2 messages to named windows glennmichael123 review this step
• af909ebe2e feat: track desktop window event transitions glennmichael123 review this step
• dba36bf143 feat: route native desktop events to live pages glennmichael123 review this step
• 84bad09a49 fix: use injected window bridge in WebView2 SDK glennmichael123 review this step
• 2133022a87 feat: read live desktop window handle state glennmichael123 review this step
• d989008ea6 test: smoke Linux named-window lifecycle in CI glennmichael123 review this step
• 4f5be9273b fix: use GTK live resize and coordinate move APIs glennmichael123 review this step
• 1e08fa5a63 feat: launch styled URL and HTML windows on desktop glennmichael123 review this step
• b489b0bf94 fix: register GTK application before opening windows glennmichael123 review this step
• 7a5fccd228 test: smoke Windows named-window lifecycle in CI glennmichael123 review this step
• 9c51096dba fix: scan shipped WebView2 loader with native artifacts glennmichael123 review this step
• 36a06c2ee2 fix: invoke pinned Zig installation on Windows glennmichael123 review this step
• 6a8dc8570b fix: locate Pantry Zig package on Windows glennmichael123 review this step
• c4339454d4 fix: support Windows Zig archive layouts glennmichael123 review this step
• fbe9cb38db test: trace WebView2 startup in Windows smoke glennmichael123 review this step
• 5234e0bc6a fix: retain Windows WebView2 controllers past callback glennmichael123 review this step
• 32bb4a3ad9 fix: route WebView2 messages by bound window subscription glennmichael123 review this step
• 06a7d9d3bd fix: defer WebView2 child creation past message callback glennmichael123 review this step
• 7da2736e9b test: verify queued WebView2 child cleanup glennmichael123 review this step
• 512de9f5b0 docs: describe cross-platform named-window lifecycle glennmichael123 review this step
• 1279f749bf docs: align desktop window lifecycle and CI coverage glennmichael123 review this step