nx_nas_book_census.nx

nx_nas_book_census.nx -- SOVEREIGN, TYPE-DRIVEN NAS book census (Reader-arc RUNG 0). MISSION: the old indexer reported 148 books -- a ~37x undercount. ROOT CAUSE: it (a) mounted only 5 of 26 NAS shares, (b) classified books BY SHARE (nas_scans->"book") instead of by FILE TYPE, (c) included #recycle junk. This organ walks ALL book-bearing mounts with getdents64 (its OWN walk -- no find/grep/python/sqlite), classifies BY FILE EXTENSION across every share, excludes Synology junk (#recycle / @eaDir), and AUTHORS the true book index + a census log. The count is whatever the walk MEASURES -- nothing is hardcoded (no 5760, no 148). COMPOSITION (anti-reinvention): reuses sys_getdents64 + dirent_reclen/dirent_type/dirent_name from nx_syscalls.nx, and the proven raw-offset getdents64 batch loop shape from _si_walk_probe2.nx:37-70 (struct-free; the NxDirent struct path crashes signal-11 under nx_cc_sovereign -- LANDMINE avoided). The ONLY new logic is: (1) an EXPLICIT directory work-stack (the proven walkers are all depth-1; we wrap the depth-1 loop in a bounded push/pop stack to descend the Calibre tree -- NOT self-recursion, JPL bounded-loop discipline), (2) the type/extension classifier, (3) the junk-exclusion substring filter. idx format mirrors nx_media_server.nx ms_handle_list exactly: one absolute path per line, '\n'-terminated, no header/footer (server splits on \n, basename = after last '/'). DEDUP: dedup is STRUCTURAL. The 10 roots are disjoint subtrees and /mnt/nas_home (the duplicate Synology tree of /mnt/nas_homes) is deliberately EXCLUDED, so a single walk of distinct roots cannot revisit any absolute path -- the walk itself is the dedup. Symlink loops are guarded by skipping DT_LNK directories (never pushed) and a hard iteration cap (bounded loop). x86-ONLY lane: sys_getdents64 from nx_syscalls.nx gates on TARGET_X86_64 -> emits 217 (rv64 numbers HANG on this native lane per nx_media_gather.nx). We never reimplement __syscall. license_tier: ORIGINAL