nx_galx_cid_index.nx

nx_galx_cid_index.nx -- SOVEREIGN O(1) cid->path store (replaces the per-request flat-TSV scan). The gallery resolved cid->path by READING + SCANNING the whole galx_cid_paths.tsv (34.5MB, 235k lines) on EVERY /img and /thumb request -- a grid page = ~60 of those = the "loading is atrocious". This builds a sovereign binary hash index (our own format, NOT a flat TSV; "nishi ecosystem all the way up"): an FNV-1a open-addressed bucket table (cid_hash -> path location) + a paths blob. Lookup is O(1) average. The .idx + .blob ARE the runtime store; the TSV is only a one-time build input (and can then be retired). Format: <idx>: [8 n_buckets][8 n_entries] then n_buckets * 24: [8 cid_hash][8 path_off][8 path_len] cid_hash==0 marks an empty bucket (a cid hashing to 0 is remapped to 1). <blob>: the concatenated path bytes (path_off/path_len locate each). Collision-safety: FNV-1a 64; for 235k entries the chance of ANY 64-bit collision is ~3e-9 (negligible); the cid itself is nxc1-<64 hex> (already a content hash) so it is effectively unique. license_tier: ORIGINAL