miden-client call: support remote account reads

[marijamijailovic]

One of the main use cases for ‎miden-client call is reading state from any public account, not just local ones.

The client already has building blocks for this (e.g. ‎ForeignAccount::Public, ‎execute_program with foreign accounts, RPC‑based state retrieval). This issue tracks adding support for calling procedures on remote public accounts via FPI.

Context and motivation: Main issue #1395, and see the comment in #1943.

[Keinberger]

Hey @marijamijailovic, thanks for filing this. As I mentioned in #1943, this is the single most important follow-up for the call command from my side. Being able to read any public account without deploying one yourself is the feature that takes this from "useful" to "indispensable".

A few design notes from my side:

Auto-detect, not a flag.
I'd strongly prefer auto-detection over an explicit --remote flag. Flow:

1. Resolve <ACCOUNT_ID> against the local store first.
2. If not found, fetch it via RPC and wrap as ForeignAccount::Public.
3. Error cleanly if the RPC says the account doesn't exist or is private.

This matches cast call's UX where the user just provides an address and the tool figures out how to read it.

Reuse existing caching.
We already have a foreign-account cache pattern in the client; repeated calls to the same remote account shouldn't refetch every time.

Error surface.
Failure modes worth handling explicitly:

• Account doesn't exist on the network: clear message, not a generic RPC error
• Account is private: tell the user this won't work for remote reads
• Network unreachable: retry hint + the configured endpoint

Interaction with #2098.
Typed rendering still needs --package. If a remote call is made without a package, we should emit a hint pointing at the package flag — otherwise the user gets raw felts back and wonders why.

For review I'd tag @igamigo as primary. Also whoever's most active on the ForeignAccount::Public / execute_program path recently, would you pull the last couple of commits there and tag them too?

Thanks!