Missing master key error when running in dev

[SkyfallWasTaken]

Steps to repro:

• Set up the dev environment as per the readme
• Visit localhost:3000, enter an email and signup details

2025-11-26 09:39:02.493413 F [11069:puma srv tp 002 deprecators.rb:86] Rails -- Exception: ArgumentError: Missing master key
/opt/homebrew/lib/ruby/gems/3.4.0/gems/lockbox-2.0.1/lib/lockbox.rb:67:in 'Lockbox.attribute_key'
/opt/homebrew/lib/ruby/gems/3.4.0/gems/lockbox-2.0.1/lib/lockbox/utils.rb:21:in 'Lockbox::Utils.build_box'
/opt/homebrew/lib/ruby/gems/3.4.0/gems/lockbox-2.0.1/lib/lockbox/model.rb:646:in 'block (3 levels) in LoginAttempt.has_encrypted'
...50 more lines of yap (why are rails stacktraces so horrible :hs:)

The fix here is to run:

openssl rand -hex 32

and set that result as the LOCKBOX_MASTER_KEY in .env.development but it'd be nice if this was in the readme!

[24c02]

feel free to add it!

[SkyfallWasTaken]

I ended up throwing it into the webauthn pr