v0.1.0-alpha.6 Moar polish from prompts & outputs

🤖 Prompts
- [cmd]: make prompts more prescriptive where needed (session start) and
  more concise where appropriate (goal commands).
  - np s: expanded with detailed goal-setting instructions including
    title length limits, description requirements, reference formatting,
    and task management examples with multi-line syntax.
  - np r: added task creation examples with multi-line description
    syntax.
  - np g s: condensed to single actionable message focusing on study
    then task planning.
  - np g u: simplified to one line about task alignment.
- [cmd/t/u]: Omit goal/desc from output
- [cmd/r]: Update instructions for new s, polish
-----BEGIN SSH SIGNATURE-----
U1NIU0lHAAAAAQAAAEoAAAAac2stc3NoLWVkMjU1MTlAb3BlbnNzaC5jb20AAAAgzEkAhr
f0dc6ZiSJXHc/mDhl7rRRGcNCSuENi7R/pfKkAAAAEc3NoOgAAAANnaXQAAAAAAAAABnNo
YTUxMgAAAGcAAAAac2stc3NoLWVkMjU1MTlAb3BlbnNzaC5jb20AAABAd86OND4qSA2u0o
2ad2PcDCCIWDl7UxrMT6GgXEuhijLZY+Tf1CdZ/28RlXUgR3Hi7+GXXU52/0e2LvGi7jxt
BAEAAITR
-----END SSH SIGNATURE-----