docs: clarify preInitialize fast path and Cardano limits

[cursor]

Summary

• update docs/architecture.md with a source-backed preInitialize fast-path guide
• fix outdated package names in the same page to match current package.json names
• document the current Cardano signing opt-out from usePreInitialize

Codepaths covered

• packages/core/src/api/device/PreInitialize.ts
• packages/core/src/core/index.ts
• packages/core/src/device/Device.ts
• packages/core/src/api/cardano/CardanoSignTransaction.ts
• packages/core/src/api/cardano/CardanoSignMessage.ts
• packages/core/src/inject.ts
• packages/core/src/types/api/preInitialize.ts
• packages/core/src/types/params.ts

Knowledge gaps addressed

• what HardwareSDK.preInitialize() actually does and returns
• when usePreInitialize hits or misses, including log markers and miss reasons
• how the 60s dedupe / TTL behavior works for repeated pre-warm calls
• why Cardano signing should not rely on the pre-initialize fast path right now

Verification

• docs-only change; verified against the source files listed above

  

[revan-zhang]

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