Inline all JSON response helpers (getCommentRepliesResp, wrapRepliesBlock,
bareCommentNode, replyNode) to avoid cross-test coupling. Fix JSON response
shape to place "node" as sibling of "repository" under "data", matching the
real GraphQL query structure. Populate "maps all fields" with non-zero
values and use a single assert.Equal for the full Discussion struct.
Match real API error responses: discussions disabled returns NOT_FOUND on
discussion, node not found returns NOT_FOUND with null node, wrong-type
node returns empty object. Add missing test cases for repo not found and
first page newest reversal.
Move shared wantComments/wantTotal/wantCursor/wantNext/wantDirection fields
into assertDisc callbacks for both TestGetWithComments and
TestGetCommentReplies, giving each case full ownership of its assertions.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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