- Introduce Star entity (procedural texture per spectral class) drawn at the origin of every non-home system; only the starting system's central body is the home world
- Freeze `homeSystemId` at roster build so lazily generated content for newly arrived systems no longer misreads as home and deals a second home world
- Anchor tether-l1 builds on newly discovered worlds (effects.tether in data/builds.json) and re-materialize installed tethers after jump cuts / scene rebuilds
- Discovery now reports the central body in every system ("Home World" vs. spectral-class star label); stars are solid but not comms targets
- Add dev tools: nav-reach-probe (soft-lock analysis), star unit tests, tether-newworld browser test; fix landing video references and Phaser stubs
