Dereference workspace lints for nix-cargo-integration compatibility

Replace `[lints] workspace = true` with explicit lint configuration in
each crate's Cargo.toml. This allows nix-cargo-integration to build
individual crates in isolation, as it cannot resolve workspace-level
lint configuration when building crates independently.

nix-bindings-expr/Cargo.toml

@@ -17,5 +17,11 @@ ctor = "0.2"
 tempfile = "3.10"
 cstr = "0.2"
 
-[lints]
-workspace = true
+[lints.rust]
+warnings = "deny"
+dead-code = "allow"
+
+[lints.clippy]
+type-complexity = "allow"
+# We're still trying to make Nix more thread-safe, want forward-compat
+arc-with-non-send-sync = "allow"

nix-bindings-fetchers/Cargo.toml

@@ -16,5 +16,11 @@ ctor = "0.2"
 tempfile = "3.10"
 cstr = "0.2"
 
-[lints]
-workspace = true
+[lints.rust]
+warnings = "deny"
+dead-code = "allow"
+
+[lints.clippy]
+type-complexity = "allow"
+# We're still trying to make Nix more thread-safe, want forward-compat
+arc-with-non-send-sync = "allow"

nix-bindings-flake/Cargo.toml

@@ -19,5 +19,11 @@ ctor = "0.2"
 tempfile = "3.10"
 cstr = "0.2"
 
-[lints]
-workspace = true
+[lints.rust]
+warnings = "deny"
+dead-code = "allow"
+
+[lints.clippy]
+type-complexity = "allow"
+# We're still trying to make Nix more thread-safe, want forward-compat
+arc-with-non-send-sync = "allow"

nix-bindings-store/Cargo.toml

@@ -23,5 +23,11 @@ pkg-config = "0.3"
 # Needed for version parsing in build.rs
 nix-bindings-util = { path = "../nix-bindings-util" }
 
-[lints]
-workspace = true
+[lints.rust]
+warnings = "deny"
+dead-code = "allow"
+
+[lints.clippy]
+type-complexity = "allow"
+# We're still trying to make Nix more thread-safe, want forward-compat
+arc-with-non-send-sync = "allow"

nix-bindings-util/Cargo.toml

@@ -12,5 +12,11 @@ anyhow = "1.0"
 nix-bindings-bindgen-raw = { path = "../nix-bindings-bindgen-raw" }
 ctor = "0.2"
 
-[lints]
-workspace = true
+[lints.rust]
+warnings = "deny"
+dead-code = "allow"
+
+[lints.clippy]
+type-complexity = "allow"
+# We're still trying to make Nix more thread-safe, want forward-compat
+arc-with-non-send-sync = "allow"