nx_wiki_backlinks.nx

nx_wiki_backlinks.nx -- wiki R4: "what links here" reverse-link index. COMPOSES (zero new storage/parse substrate introduced): nx_wiki_index_builder NxWikiDocStore: doc_count + per-rowid (title, url, body) lookup -- the page corpus. nx_syscalls sys_mmap for the reverse-map scratch. WHAT IT DOES: Every wiki page body carries forward [[wikilink]] cross-references (resolved/rendered by nx_wiki_doc_render). This organ INVERTS them: given a target slug, it enumerates the source pages whose bodies link TO it. That is the classic wiki "What links here" affordance, computed from ground truth (the actual bodies in the doc store), never a hand-maintained list. IDENTITY MODEL: A page's identity ("slug") is its store URL field as-stored. The wiki convention is a bare name (e.g. "alpha") or "/wiki/alpha"; a [[alpha]] wikilink targets that same slug. nx_wiki_backlink_slug_matches compares a link target against a stored slug allowing the optional "/wiki/" prefix on either side, so both conventions resolve. [[cite:...]] links are SKIPPED -- those are supporting-source citations handled by nx_wiki_cite_render, not page-to-page cross-references. Hygiene (NISHI_CODE_HYGIENE_STANDARD): M1 out-params not *T returns; M3 every while has a hard iter cap; M5 every buffer index bounded; M6 no pretend stubs; M7 named sizing constants; M8 verdicts propagated. Status: V1 (wiki R4). 2026-06-15. license_tier: ORIGINAL