v0.3.0

Prompt safety and UX:

• Auto-skip the [Y/n/s] prompt when the user has pre-typed input in
  the tty buffer — pre-typed bytes are no longer consumed as the
  answer, and the prompt line is shown as auto-dismissed. Pattern
  credited to Philippe Troin (zsh-users 2022/msg00062); merged from
  @georgeharker.
• Unknown keys at any prompt now decline (n) instead of accepting
  the caller's default. A stray w/q/etc. can no longer confirm a
  mutating upgrade.
• Internal version reporter (--check-env) updated to match the tag.

Docs and CI:

• README documents install via @georgeharker/zdot.
• Fixed two latent Linux/bash5 bugs surfaced by CI.
• CI status badge added to README.