TSSIM/JESIM final v35 - land subsidence no-slip fix

Based on v34.

Change:
- If a source cell is on land/solid and the computed water deformation height is negative
  (subsidence lobe), the cell is ignored for source-node slip/M0 footprint.
- Land cells with positive uplift or height=0 footprint-only behavior are still allowed
  to carry slip for inland rupture area.
- Ocean/sea negative-height cells still remain as visible water subsidence with slip_m=0.

Why:
- v32/v34 correctly set negative-height subsidence nodes to slip_m=0.
- But when that negative lobe fell on land, set_source_cell_height() converted it to
  footprint-only height=0, which then got slip_m again. This made land-side subsidence
  incorrectly count as rupture footprint.

Kept from v34:
- M0/Mw area counts only uplift nodes and height=0 slip>0 footprint nodes.
- Negative-height subsidence nodes are excluded from M0/Mw.
- Advanced node tuning and multiselect remain.
- JESIM sends arrived observations every 5 minutes, with packet_meaningful_update.
- Shimizu/清水 removed.
- Transmit-only mode 60 h cap.
- Wall-clock 1x observation transmission.
- No axis flip.
