Runrail 0.3.0

• Add runrail claude and runrail codex launch commands that preserve the
  installed vendor CLIs' arguments, terminal streams, working directory, and
  exit codes. Vendor authentication and execution policy stay caller-owned;
  Runrail-managed sessions remain available through the run backends.
• Add --harness-fast-mode on|off for managed Claude Code and Codex sessions;
  an explicit off selects the standard service tier even when Codex has a
  saved fast-mode preference.
• Keep structured Claude Code and Codex questions pending until complete
  answers arrive. Callers can stop the run instead of declining an unanswered
  form.
• Update the pinned public @nifrajs/* packages and the Nifra app starter to
  5.11.0; the packed-consumer check now tests that published package set.