v0.3.1 — points to ALGAL, readable CLI

Since v0.3.0:

• Morphogen is the earlier prototype of ALGAL. The README and every help screen now say so and point to https://algal.computer; new work belongs there.
• morphogen alone prints a short start screen, and morphogen --help is grouped and under 60 lines. Maintainer commands (foundry, bench, store, slots) move to morphogen help advanced.
• Every command has its own help: morphogen <command> --help, -h and morphogen help <command> print the same text.
• morphogen --version prints morphogen 0.3.1; --version --json keeps the JSON object.
• Errors are one sentence and one next command, such as ✗ Unknown command "rnu". Did you mean "run"? then → morphogen --help. Usage errors exit 2. With --json or when a coding agent runs it, errors are one {"ok":false,"error":{...}} object on stdout.
• Symbols fall back to ASCII for TERM=dumb, non-UTF-8 locales and HRANESS_ASCII=1; color appears only on a terminal and never with NO_COLOR.