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xor_xe
4ac5f07e88
A full graphify update evicted every edge whose source_file was a re-extracted source, including LLM semantic edges (e.g. semantically_similar_to) from Markdown docs that also have an AST extractor. The AST pass cannot regenerate those edges, so they were silently lost while their concept nodes survived — node eviction is provenance-aware via _origin (#1116), edge eviction was not. Tag AST-extracted edges with the same _origin=ast marker nodes already carry, and scope rebuild-driven edge eviction to that tier: re-extraction replaces a source's AST edges, while its semantic edges survive until a semantic re-extraction supersedes them. Deletion-driven eviction stays provenance-blind, so edges of deleted or excluded sources are still purged regardless of tier. Edges from graphs built before this change lack the marker; a stale AST edge from a file changed exactly once between the old and new version can linger until its source is deleted — the same migration trade-off the #1116 node marker made.