Brian Fertig d9fc9df829 Cap tether progression at level 3 and remove tether_l4 research node ... - Reduce maxLevel from 12 to 3 in data/tether.json - Remove the tether_l4 entry from exploration.json; tether_l3 now has empty unlocks - Update research-builds and tether tests to reflect the shorter chain (3 layout rows, level checks for 1–3 only) - Revise PROJECT_NOTES.md to describe the 3-level progression		2026-09-06 15:20:31 -06:00
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exploration.json	Cap tether progression at level 3 and remove tether_l4 research node	2026-09-06 15:20:31 -06:00