Add Brave CDP automation, replace Oracle browser mode

Connects to user's running Brave via Chrome DevTools Protocol
to automate ChatGPT interaction. Uses puppeteer-core to open a
tab, send the prompt, wait for response, and extract the result.

No cookies, no separate profiles, no copy/paste. Just connects
to the browser where the user is already logged in.

One-time setup: relaunch Brave with --remote-debugging-port=9222

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

node_modules/netmask/example/ipcalc.coffee

@@ -0,0 +1,17 @@
+Netmask = require('netmask').Netmask
+
+ip = process.argv[2]
+netmask = new Netmask(ip)
+
+out = console.log
+out "Address: #{ip.split('/', 1)[0]}"
+out "Netmask: #{netmask.mask} = #{netmask.bitmask}"
+out "Wildcard: #{netmask.hostmask}"
+out "=>"
+out "Network: #{netmask.base}/#{netmask.bitmask}"
+out "HostMin: #{netmask.first}"
+out "HostMax: #{netmask.last}"
+out "Broadcast: #{netmask.broadcast}"
+out "Hosts/Net: #{netmask.size}"
+
+out netmask.next()