Workspace lints and disallow unwrap (#855)

Sets submodules to use workspace lints. Added denying unwrap as a
workspace level lint, which found a couple of cases where we could have
propagated errors. Also manually labeled ones that were fine by my eye.

codex-rs/mcp-client/Cargo.toml

@@ -3,6 +3,9 @@ name = "codex-mcp-client"
 version = { workspace = true }
 edition = "2024"
 
+[lints]
+workspace = true
+
 [dependencies]
 anyhow = "1"
 mcp-types = { path = "../mcp-types" }