rob thijssen 29033e8bb8 feat: post-quantum only; no derivation, no MetaMask shim, no Ethereum addresses ...

Moves to the quantus.3 forks of keyring, util-crypto, networks and ui-keyring,
which hold only ML-DSA keys and have deleted the classical primitives
(quantus/common#6). What in the extension depended on them goes too:

- the derive-from-parent flow (Popup/Derive, pri(derivation.*), the
  AccountsContext master, the menu entries): ML-DSA pairs have no //hard/soft
  derivation, and Quantus derives every account from the mnemonic instead
- extension-compat-metamask, which injected Ethereum accounts
- the Ethereum branches in Address and the //m/44'/60' suri suffix
- canDerive and nextDerivationPath, now unused

Restoring a JSON backup of a classical key shows the keyring's reason ("ed25519
keys are not quantum-safe and cannot be held here...") rather than "Invalid
Json file", for single and batch files.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012uDUodEcRbBwNRi3UCmw8f

2026-09-16 21:28:01 +03:00

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