refactor(cli): drop alloy-ethers-typecast for alloy Provider

[thedavidmeister]

Removes the alloy-ethers-typecast git dependency from the rain-metadata cli — the last blocker to publishing the cli to crates.io (#121).

• ReadableClient / ReadContractParameters(Builder) → alloy Provider + eth_call (TransactionRequest + SolCall::abi_decode_returns), same pattern as the interpreter parser (rainlang#511).
• rain-erc git dep → crates.io 0.1 (its supports_erc165 is now Provider-based).
• implements_i_described_by_meta_v1 is generic over Provider; fetch_for_contract builds a provider from the first RPC.
• Tests use alloy connect_mocked_client instead of ReadableClient::new_mocked.

All 120 cli lib tests pass; no alloy_ethers_typecast references remain.

Note: fetch_for_contract now reads from the first RPC rather than ReadableClient's multi-RPC fallback — fine for the cli; a fallback provider can be added later if needed.

Closes #121.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: f6e36f19-6ab6-4bf1-9cc2-0f164b0fc5f9

📥 Commits

Reviewing files that changed from the base of the PR and between bc518a9 and 7b30190.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (3)

• crates/cli/Cargo.toml
• crates/cli/src/meta/mod.rs
• crates/cli/src/meta/types/authoring/v2.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-26-cli-drop-typecast

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