docs: document Ledger adapter stack and refresh package names

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Summary

• document the HWK Ledger adapter stack in the top-level package map and architecture overview
• add a focused packages/hwk-ledger-adapter/README.md quickstart for connector selection, UI request handling, and troubleshooting
• refresh the hd-transport-web-device package naming in docs to match current package names

Docs updated

• README.md
• docs/architecture.md
• packages/hwk-ledger-adapter/README.md
• packages/hd-transport-web-device/README.md

Codepaths covered

• packages/hwk-ledger-adapter/src/adapter/LedgerAdapter.ts
• packages/hwk-ledger-adapter/src/adapter/methods/allNetworkGetAddress.ts
• packages/hwk-ledger-adapter/src/errors.ts
• packages/hwk-ledger-adapter/src/index.ts
• packages/hwk-ledger-connector-webhid/src/index.ts
• packages/hwk-ledger-connector-ble/src/index.ts
• packages/hwk-adapter-core/src/types/wallet.ts
• packages/hwk-adapter-core/src/events/ui-request.ts

Knowledge gaps addressed

• where the Ledger adapter stack fits relative to the existing hd-core SDK
• which connector to use for WebHID vs React Native BLE
• why hosts must answer uiResponse(...) events for permission, reconnect, and app-install flows
• common integration pitfalls such as multiple USB devices, ephemeral connectId, and missing Ledger apps