ci(engage): use all-features devshell for cargo doc / rustdoc --all-features

Signed-off-by: strawberry <strawberry@puppygock.gay>

engage.toml

@@ -69,7 +69,10 @@ script = "cargo fmt --check -- --color=always"
 name = "cargo-doc"
 group = "lints"
 script = """
-RUSTDOCFLAGS="-D warnings" cargo doc \
+env DIRENV_DEVSHELL=all-features \
+    RUSTDOCFLAGS="-D warnings" \
+    direnv exec . \
+    cargo doc \
         --workspace \
         --all-features \
         --no-deps \