v0.5.0

Added

• Live per-hook progress for poly hooks — when stderr is a terminal, each
  hook now prints a ▶ <id> … line as it starts and a ✓/× <id> (<duration>)
  line as it finishes, so a long-running hook (cargo clippy, cargo test, …) is
  visibly running instead of leaving the terminal blank until the whole stage
  completes — which read as a hung commit. Progress goes to stderr and is
  suppressed when stderr is not a terminal (piped / CI), so captured output is
  unchanged.
• Autofixable count in the lint summary — poly lint now reports how many of
  the findings can be resolved automatically (N fixable with the --fix option.), making the value of a follow-up --fix run obvious from a dry run.
  The line is omitted when nothing is fixable.