feat(sim): add dynamic tx power policy

[Komzpa]

Summary

• add an opt-in Dynamic TX Power policy that can lower per-packet TX power immediately before transmit
• keep configured PTX as the maximum; DTP never boosts above the regional/base power
• reduce relay/ACK interference radius under busy channel pressure or strong prior-hop evidence, while keeping origin packets and rescue retries at full power
• add DTP power histograms, CR@power histograms, mean detected/sensed receiver stats, CLI knobs, docs, and tests

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, and feat(sim): add dynamic coding rate policy #71; until the prerequisite PRs merge, GitHub will show their commits in this diff too
• intended review commit for this slice: 68f49f5

Validation

• .venv/bin/python -m unittest tests.test_dtp tests.test_dcr tests.test_lora_mesh_cli tests.test_discrete_event_sim tests.test_node
• /home/kom/.local/bin/ruff check loraMesh.py lib/config.py lib/dcr.py lib/dtp.py lib/node.py lib/discrete_event_sim.py tests/test_dtp.py tests/test_dcr.py tests/test_lora_mesh_cli.py tests/test_discrete_event_sim.py tests/test_node.py
• .venv/bin/python -m compileall -q .
• .venv/bin/python -u loraMesh.py 2 --no-gui --simtime-seconds 5 --period-seconds 0.5 --dcr --dtp --phy-loss-model --capture-collision-model
• git diff --check
• .venv/bin/python -m unittest
• rg -n "stavnet|guest:guest|grafana|source_node_id|source_long_name" .

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