{
 "_doc": "Canonical per-model J-lens regime registry. Band = inclusive layer range whose lens readout shows workspace behavior (persist+content high, sensor/motor low; exp4_regimes.py). kv_share_start = first layer reusing KV from below (entrances at or above it are structurally null for band looping). Lives in results/ next to the raw jbar tensors and exp4 scan logs; bucket mirror: results-lens/. Revisions are the pinned model SHAs the scan ran on.",
 "google/gemma-4-E2B-it": {
  "revision": "9dbdf8a839e4e9e0eb56ed80cc8886661d3817cf",
  "num_layers": 35,
  "hidden": 1536,
  "workspace_band": [
   14,
   30
  ],
  "kv_share_start": 15,
  "jbar": "results/jbar.pt",
  "scan": "results/exp4.log",
  "status": "mapped + loop-validated (full program, PAPER.md)"
 },
 "google/gemma-4-12B-it": {
  "revision": "0e2b1058541244490925fbacf8972041435691ac",
  "num_layers": 48,
  "hidden": 3840,
  "workspace_band": [
   36,
   45
  ],
  "kv_share_start": null,
  "jbar": "bucket:results-lens/jbar_12b.pt",
  "scan": "results/exp4_12b.log",
  "status": "mapped + loop-validated (adaptive-alpha required; MBPP only)"
 },
 "google/gemma-4-E4B-it": {
  "revision": "fa62d88df2e6df5efa9d26ad6b3beaea2765f0cd",
  "num_layers": 42,
  "hidden": 2560,
  "workspace_band": null,
  "kv_share_start": 25,
  "jbar": "results/jbar_e4b.pt (150/256 prompts \u2014 ckpt-salvaged)",
  "scan": "results/exp4_e4b.log",
  "status": "mapped 2026-07-16, PROVISIONAL: no clear workspace signature. sensor L11-22 (peak 0.36@L22), motor onset L23 rising to 0.52@L41, persistence flat ~0.05-0.13 (E2B's band-entry persistence bump is ABSENT). Candidate thin band L23-28 sits inside the KV-shared zone (L24+) \u2014 band looping likely structurally hampered on E4B. Needs: ignition cross-check + full-prompt jbar top-up before strong claims."
 },
 "google/gemma-4-31B-it": {
  "revision": "b9ea41a2887d8607f594846523f94c6cc75ac8a4",
  "num_layers": 60,
  "hidden": 5376,
  "workspace_band": null,
  "kv_share_start": "none found in config (no num_kv_shared_layers key printed \u2014 verify in scan; if truly absent, all entrances structurally live)",
  "jbar": "bucket:results-lens/jbar_31b.pt (256/256 prompts)",
  "scan": "results/exp4_31b.log (regimes_31b.pt reconstructed via parse_regimes_log.py; scan's own save hit the results/-CWD bug)",
  "status": "mapped 2026-07-16, PROVISIONAL: E2B-style mid-depth workspace signature ABSENT (like E4B). Persistence+content bump sits EARLY instead \u2014 L7-16 (persist 0.30-0.49 peak L14, content 0.76-0.97, sensor/motor ~0). Sensor is two-lobed: L26-40 (peak 0.17@L26) and L49-56 (~0.12). Motor essentially absent until the final layer (0.06-0.07 L50-56, 0.20@L59). Ignition cross-check (in-log): commitment pinned hard through L38, collapses to ~0 at L42-46, becomes write-responsive at L54-58 (sign flips with w>=0.5 on all three pairs). Early persist zone vs late write-responsiveness disagree \u2014 no single band supported yet; needs jbar-side analysis before any band is entered."
 },
 "google/gemma-4-26B-A4B-it": {
  "revision": "01e5b3ee840d3a9e0b0b493c593e85398a30ef75",
  "num_layers": 30,
  "hidden": 2816,
  "workspace_band": null,
  "kv_share_start": null,
  "jbar": "bucket:results-lens/jbar_26b_a4b.pt (256/256 prompts)",
  "scan": "results/exp4_26b_a4b.log + results/regimes_26b_a4b.pt (saved directly \u2014 first scan through the patched exp4_regimes.py; includes full per-layer ignition tensors)",
  "status": "mapped 2026-07-16, PROVISIONAL: only 30 layers (MoE, A4B active; num_kv_shared_layers=0 in config \u2014 all entrances structurally live). Same family pattern as E4B/31B, NOT E2B: persistence bump EARLY and thin (L5-6, 0.33/0.25), then flat ~0.03-0.08; sensor lobe L10-18 (peak 0.21@L13); motor weak and only terminal (0.11@L29); content high throughout mid (0.6-0.93). Ignition heavily saturated (many +/-1.00 cells) but write-responsive late: L22-26 commitment flips to the written concept at w>=0.5 on all three pairs (dog/piano L26 -1.00 -> +1.00). MoE lens-validity check still required before trusting any band; no band entered."
 }
}