Add the sections REPO_POLICIES.md requires that the README lacked: a
first line naming category, license and author; Getting Started;
Entrypoints (one line per script/ file); Rationale; Design (the
internal/ packages, with the existing "Adding a key type" note moved
under it); TODO (the open issues between the tree and 1.0, as links);
License; and Author. Add the age recipients and identity vectors for
the eleven-abandon example mnemonic, copied from the agekey test, and
the BIP-85 specification's own 12-word child mnemonic vector, copied
from the childmnemonic test.
Documentation only; no code changes.
Model: opus-4-8
sneak