reorg(characters): ship-time folders — lena_base_v01 ships, lane moves to work/lena

REGISTRY rewritten around the central rule: a character folder is born only
when a body ships to ariki-game (<character>_base_v<NN> = ship ordinal).
lena_nude dissolves accordingly:
- characters/female/lena_base_v01/ — SHIPPED 2026-08-10: AccuRig GLB carrier,
  T-pose/rig FBX + JSON, previews, frozen README
- characters/work/lena/ — the live lane: recipes 01-47 (incl. new 36-47:
  refill/sheets/clay/despeckle/musculature/spin/AccuRig export/graft/pose QC),
  masters (athletic_v04 blend + textures, accurig blend), lane-history README
- hires_claude/hires_work intermediates (blends, logs, probes) pruned

Supporting docs: AGENTS.md, working-files rule, rig-graft plan addendum,
originals README, prune_lane.py.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

characters/work/lena/.lanekeep

@@ -0,0 +1,24 @@
+# .lanekeep — .blend files pinned as MASTER in this lane.
+# Everything else a step script writes is scratch: regenerable by re-running the
+# NN_*.py recipe from the pinned master above it.
+# Read by tools/prune_lane.py. One filename per line, # for comments.
+#
+# Rule: a .blend earns a line here only when a SHIPPED artifact was built from it,
+# or it is the head of the live chain. Intermediate attempts never get pinned —
+# only the state at the end of a fix.
+
+# The three pinned chain heads live in masters/ and are pinned by masters/.lanekeep —
+# prune_lane.py matches bare filenames against the manifest in the SAME directory, so
+# a "masters/foo.blend" entry here would match nothing. This lane holds no .blend of
+# its own: roll one work.blend while experimenting and it stays correctly SCRATCH.
+
+# _bust_wall_cache.npy is the bi-harmonic chest wall for 34_v04 (an 8-minute CG solve).
+# Keep it while bust size is still in play: 33/34 reuse it and a different k then costs
+# seconds instead of minutes. Regenerable, and invalid for any other mesh.
+#
+# masks.npz is NOT regenerable without the full-res sculpt — it was transferred from the
+# 953,966-v original mesh, which no longer exists on disk.
+#
+# Pruned 2026-08-11: the 00/06/07/10/27/29b sculpt snapshots, the athletic v01-v03 and
+# str_055/145 studies, the atlas/refill/probe branches and ~50 review/beauty render dirs.
+# 4.08 GB. The recipes above rebuild any of them.