feat: restore wallet helpers as a first-class operation type

[thephez]

Reintroduce the Wallet operation type dropped in the Evo SDK rewrite (4ce19f5), now backed by the package-level wallet namespace. Phase 1 adds ten key-generation/utility operations: generate/validate mnemonic, mnemonic to seed, generate key pair(s), key pair from WIF/hex, pubkey to address, validate address, and sign message.

Wallet operations run locally in wasm and never touch the platform: executeSelected() skips ensureClient() for the wallet type, and network-dependent operations read the new getSelectedNetwork() helper (unifying the previously inconsistent radio fallbacks on mainnet).

The type extractor learns namespace-function declaration modules and package-level sdk_examples; docs render wallet as wallet.method with a local-execution note. A new preserveWhitespace flag keeps the sign-message text and BIP39 passphrase untrimmed, since whitespace there is significant.

Tests: wallet dispatch unit suite, getSelectedNetwork() coverage, namespace-function extractor fixtures, and an e2e suite with deterministic fixtures plus an offline guarantee asserting zero external requests.

[coderabbitai]

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