[MEMORY] Duplicate wiki sources (same URL as already-compiled source) should be detected and moved to `_hard/`
[MEMORY] Wiki uses graph layer with ontology.yaml
[MEMORY] Wiki graph regeneration: run `wiki_graph_lint.py` + `wiki_graph_extract.py` after each ingest batch that adds graph metadata
[SKILL] wiki-compile: idempotent wiki source compilation — check if pages already exist (skip if so), detect duplicate URLs → `_hard/`, handle ambiguous/conflicting sources → `_hard/` + log, move processed to `_done/`, run graph lint+extract after batch
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