UR-Nexus 1.54.1

• Fixed /speak, /computer, /memory-suggest, /import-session and
  /permission-profile being unreachable from the shell. They were registered
  as slash commands but never wired into the Commander tree in main.tsx, so
  ur speak "hi" was parsed as the interactive prompt and failed with "too
  many arguments". All five now have shell subcommands with their own flags.
• Fixed argument parsing in the three new commands. The shell wiring quotes
  every argument, so split(/\s+/) yielded "'100'" rather than 100 and
  numeric arguments were rejected. They now use the quote-aware
  parseArguments, matching every other local command.
• Quieted scripts/backfill-releases.mjs: gh release view writes "release
  not found" for each unpublished tag, which is the expected answer during a
  scan and was burying the plan in twenty lines of noise.