Implement remaining network methods for networkLite

[Copilot]

networkLite lacked implementations for 8 network package methods. Two already worked (get.inducedSubgraph, network.density); six required implementation.

Implementation Strategy

The network package (version >= 1.19.0) provides S3 generics for these methods. This PR implements the .networkLite S3 methods that dispatch through the network package's native generics:

• networkLite-specific implementations leveraging the simplified edgelist structure
• Proper S3 method dispatch via network package generics

Methods Implemented

Edge queries:

• get.edgeIDs.networkLite(x, v, alter, neighborhood, na.omit) - single dyad or incident edges
• get.dyads.eids.networkLite(x, tails, heads, ...) - vectorized multi-dyad queries
• get.edges.networkLite(x, v, alter, neighborhood, na.omit) - incident edge IDs

Topology queries:

• is.adjacent.networkLite(x, vi, vj, na.omit) - edge existence test (default na.omit=FALSE matches network package)
• get.neighborhood.networkLite(x, v, type, na.omit) - adjacent vertices
• has.edges.networkLite(net, v) - any incident edges on vertices

Example Usage

nw <- networkLite(10, directed = TRUE)
add.edges(nw, c(1,2,3), c(2,3,4))

# Works with both networkLite and network objects
get.edgeIDs(nw, 1, 2)           # [1] 1
is.adjacent(nw, 1, 2)            # [1] TRUE
get.neighborhood(nw, 2)          # [1] 3 1

# Handles missing edges correctly
nw_na <- networkLite(5, directed = TRUE)
add.edges(nw_na, 1, 2, names.eval = list("na"), vals.eval = list(TRUE))
is.adjacent(nw_na, 1, 2, na.omit = FALSE)  # TRUE (edge exists)
is.adjacent(nw_na, 1, 2, na.omit = TRUE)   # FALSE (edge is missing)

All methods support directed/undirected/bipartite networks and properly handle the na edge attribute.

Compatibility

Requires network package >= 1.19.0 (currently on master branch) which provides the S3 generics for proper method dispatch.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Implement remaining network methods for networkLite if necessary.</issue_title>
<issue_description>They are:

• get.edgeIDs()
• get.edges()
• get.dyads.eids()
• get.inducedSubgraph()
• get.neighborhood()
• is.adjacent()
• network.density()
• has.edges()

Some of them may work out of the box, particularly if they do not depend on network's internal structure.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Implement remaining network methods for networkLite if necessary. #13

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[krivit]

@copilot Refer to statnet/network@master for the current methods for network, which have been turned into generics.

[Copilot]

@copilot Refer to statnet/network@master for the current methods for network, which have been turned into generics.

Updated to use the generics from network package master branch. Removed the wrapper generic definitions and default methods, keeping only the .networkLite S3 methods. The implementation now properly dispatches via the network package's generics (commit 0373063).