Brian Fertig 70f4954c69 Wire research→build unlocks and add first tether-l2 build entry ... - Define the two-sided unlock contract: research nodes declare `unlocks.builds`/`unlocks.research`, builds declare `requires` as "category/node id" (authoritative gate); ResearchModel exposes `unlocksOf`, `buildDefs`, `unlockIssues`, `buildIssues` - Add `tether-l2` build entry (planet/station targets, credits+minerals cost, level-2 tether effect) and link it from `exploration/tether_l2` - Show an UNLOCKS line in the research dossier so the console surfaces what a tech opens - Extend dev/research-builds.test.mjs to validate both sides of the gate and the new model helpers - Update data/builds.json, research.json, exploration.json `_comment`s and PROJECT_NOTES to document the contract		2026-09-05 15:15:08 -06:00
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PROJECT_NOTES.md	Wire research→build unlocks and add first tether-l2 build entry	2026-09-05 15:15:08 -06:00