chore(vendor): silence upstream lint noise in vendored libsql (#272)

Cargo treats path dependencies as local code, so the vendored libsql
copy printed nine upstream warnings (mismatched_lifetime_syntaxes,
private_interfaces) on every check/clippy run. Allow the two lints in
the vendored crate's own manifest; the block is dropped together with
the vendor patch once upstream makes disconnect idempotent.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: ScriptedAlchemy

vendor/libsql/Cargo.toml

@@ -25,6 +25,14 @@ readme = "README.md"
 license = "MIT"
 repository = "https://github.com/tursodatabase/libsql"
 
+# Local addition to the vendored copy (see [patch.crates-io] in the workspace
+# Cargo.toml): cargo treats path dependencies as local code and prints their
+# warnings on every check/clippy run. Silence the two upstream lints so
+# workspace builds stay noise-free; drop with the vendor patch itself.
+[lints.rust]
+mismatched_lifetime_syntaxes = "allow"
+private_interfaces = "allow"
+
 [package.metadata.cargo-udeps.ignore]
 normal = ["hyper-rustls"]