fix: Edge.__eq__ checks isinstance(other, Edge) not Node

[totto]

What

Edge.__eq__ compared the other object against Node instead of Edge, making edge equality always return False when comparing two edges.

Why it matters

Any code that deduplicates, checks membership in a set, or compares edges directly silently fails. For example:

edge_a = EntityEdge(uuid="abc", ...)
edge_b = EntityEdge(uuid="abc", ...)
edge_a == edge_b  # False — wrong, same UUID
{edge_a} == {edge_b}  # False

Fix

One character: Node → Edge in the isinstance check.

Test

from graphiti_core.edges import EntityEdge

e1 = EntityEdge.__new__(EntityEdge)
e1.uuid = "test-uuid"
e2 = EntityEdge.__new__(EntityEdge)
e2.uuid = "test-uuid"
assert e1 == e2          # was False, now True
assert not (e1 == "x")  # still False for non-Edge

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[totto]

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