Move the client-rust pin past the merged fixes; re-state converged claims

[eduralph]

When tikv/client-rust#544 (and #547) merge: advance pins.toml client_rust.rev, let XCONVERGE fire, and re-state G-0001 as expect = "agrees" — the designed lifecycle. The move also picks up tikv/client-rust#548 (contextual logging, merged 2026-07-11).

Roadmap §3.4 · ledger.toml · scripts/ledger-check.sh