C2 sub-task (ii): extend sandbox loop to ip-ranges/ip-addresses; load + verify D-120 bands ...

Closes the logged tooling gap and the D-120 Step 6 load, verified end to end. With
this, C2 is fully closed and Stage 2 close-out (C1..C5) is COMPLETE.

Tooling:
- prod-draft-dump.py: ENDPOINTS += ipam/ip-ranges, ipam/ip-addresses (ranges get a
  synthetic start-end key). Verified live.
- sandbox-fidelity-check.py: KEY + EXPECTED_NEW cover the 3 D-120 ranges + 2 service
  IPs; both-bounds gives endpoint/address correctness (pure delta -- the frozen draft
  has none). Success banner now D-115/D-117/D-118/D-120. Harness +T11/T12 (12->14).
- netbox/d120-compose-bands.py: stdlib, UA-aware, SANDBOX_HOSTS-guarded, dry-by-default,
  whole-plan preflight (parent 10.10.1.0/24 exists, endpoints in-parent, start<=end) so
  it cannot half-write. Harness 16/16 pins the band values + guards.

Load (operator-approved --commit into office1-netbox, the VR1 apex; sandbox-local):
- created 3 ip-ranges (.2-.49 / .100-.200 / .201-.254) + 2 ip-addresses (.10 netbox,
  .11 tailscale), 0 already present. Re-dump -> 3 ranges, 2 IPs. Fidelity check -> exit 0,
  "EXACTLY the planned delta (D-115/D-117/D-118/D-120)."

D-120 Step 6 CLOSED (no apex write -- write-back stays deferred). Gauntlet ALL GREEN
(60); repo-lint 0 fail. Workflow C2 row + session-ledger updated: Stage 2 close-out
complete -> branch->main merge point reached (merge remains operator-gated).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015WgVrZE2ryY9aXP7JiBuwj