Kept all units in transport mode with reticulum.transport_enabled(true).
Removed physical blocking: SIM_PHY_BLOCK_BOB_CY=0, no per-unit block.
Removed the extra deep transmission/debug flags from platformio.ini.
Kept the 204 announcement schedule/protocol.
Removed intentional Link teardown after message cycles.
Every unit now attempts an outbound Link to every peer that announces.
Added retry health behavior: 3 Link attempts within 3 minutes, then wait for a fresh announce before trying that peer again.
Preserved substantive parseable logs: TX ANNOUNCE, RX ANNOUNCE, TX LINKREQUEST, LINK ACTIVE, TX LINK, RX LINK, retry/failure/reset events.
Updated copied helper scripts to point at 205_sustained_link.
Updated README for the new exercise behavior.
