- New `data/research/mining.json` tree (Improved/Advanced Mining Arm, Improved Storage) as blueprints that unlock matching builds
- Three new ship-scoped builds in the console's Mining tab: mining arm rate 1.5/2.0 minerals/s and hold cap 350; MAX-guarded effects applied to `ship.stats`
- Tether Level 3 promoted from research-direct effect to a build (tether-l3) gated on L2 tether, consistent with L2 blueprint pattern
- `BuildState.isBuiltAnywhere` + `isShipScoped` so ship upgrades count as built wherever the ship lands (no re-buy), records still key the planet
- `GameScene._restoreMiningUpgrades` re-derives ship mining stats from build records on load; `_applyMiningUpgrade` handles rate/capacity with toasts and HUD refresh
- New procedural icons: tether3, mining, mining2, storage
- Updated tests (builds, research-builds), diagnostics (BuildDiag v4), docs, README, manifest
