chore(cargo,mcp): bump rmcp to 3.4.0, fix deprecated ServerInfo usage

[newhoggy]

Summary

• Bump rmcp from 3.3.0 to 3.4.0, which introduces model::ServerConfig as the replacement for the deprecated model::ServerInfo type alias.
• Switch OmniDevServer::get_info in src/mcp/server.rs to use ServerConfig (same underlying InitializeResult type), clearing all 3 #[warn(deprecated)] warnings.

Test plan

• cargo build --features mcp --lib — clean, no warnings
• cargo clippy --features mcp --lib -- -D warnings — clean
• cargo test --features mcp --lib mcp:: — 790 passed, 0 failed

[github-actions]

Coverage

Total: 97.27% ⚪ 0 pp vs main

Comparing d112f5b..b8bf9e2 (merge-base → PR head)

No per-file coverage changes vs main.

🔇 5 ignored region(s), 0 tolerated region(s)

ignore removes the lines from both reports; tolerate keeps them in the reported percentage but scores them against the baseline, so a cross-run flip cannot move a delta. Regions are read from each revision's own source.

File	Kind	Lines	Rev	Reason
src/cli/drive/lease.rs	ignore	418-422	both	a sheet restore's fresh backup is always a DriveCopy — restore.rs's own recheck refuses unless the target is still a spreadsheet, and acquire() only ever takes a Bytes backup of a non-native target; this arm exists solely for exhaustiveness over the shared LeaseBackup enum
src/cli/drive/lease.rs	ignore	1000-1003	both	guards this test helper against misuse; every call site below passes an acquire subcommand
src/cli/drive/lease.rs	ignore	1014-1017	both	guards this test helper against misuse; every call site below passes a prune subcommand
src/drive/lease/ledger.rs	ignore	812-816	both	mutate_locked refuses before ever calling the closure, so its body never runs — a hit here is a regression, not a coverage gap
src/drive/lease/restore.rs	ignore	1137-1141	both	every test using this double refuses before authenticating; a hit here is a regression, not a coverage gap

Patch coverage

Patch: 100% (2/2 new lines covered)

File	Patch	Uncovered new lines
src/mcp/server.rs	100% (2/2)	—

_{📦 Full per-file coverage summary · run summary}