feat(sim): add batumi radio preset

[Komzpa]

Summary

• add a packaged batumi real-mesh scenario preset with sanitized local node geometry
• bundle matching Batumi/Georgia-area terrain and OpenStreetMap-derived land-cover clutter CSVs
• apply aggregate radio calibration from the preset without runtime pair-specific lookup tables
• add --preset, --list-presets, and --list-modem-presets CLI support plus calibration documentation
• add tests that the bundled nodes/terrain/clutter stay inside the Batumi/Georgia bbox and publish no source node IDs/names

Stack

• split from feat(sim): add Batumi radio physics for DCR #64
• stacked after refactor(sim): make lora mesh cli importable #67, feat(sim): add map and terrain inputs #68, feat(sim): add land-cover clutter inputs #69, feat(sim): add capture-aware rf physics #70, feat(sim): add dynamic coding rate policy #71, and feat(sim): add dynamic tx power policy #72; until the prerequisite PRs merge, GitHub will show their commits in this diff too
• intended review commit for this slice: b65a6b1

Validation

• .venv/bin/python -m unittest tests.test_presets tests.test_docs tests.test_lora_mesh_cli tests.test_radio_loss tests.test_link_model
• /home/kom/.local/bin/ruff check loraMesh.py lib/presets.py tests/test_presets.py tests/test_docs.py tests/test_lora_mesh_cli.py
• .venv/bin/python -m compileall -q .
• .venv/bin/python -u loraMesh.py --preset batumi --no-gui --simtime-seconds 5 --period-seconds 2 --phy-loss-model --capture-collision-model --dcr --dtp
• git diff --check
• .venv/bin/python -m unittest
• rg -n "stavnet|guest:guest|grafana|source_node_id|source_long_name" .

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