manycode 0.4.0 - ccshare is now manycode

• ccshare is now manycode. Same tool, wider name - it was never only about
  Claude Code, and the sessions were never only two people. Nothing breaks:
  the ccshare command keeps working as an alias, ~/.ccshare migrates to
  ~/.manycode automatically on first run, CCSHARE_* environment variables
  are still honored (MANYCODE_* is the new spelling), the github repo
  redirects from the old URL, and existing installs update in place - this very
  update notice is proof.