Add runway tool with auto-detected inbound ships; fix multi-base state tagging

- tools/runway.py: days of runway per material before a base stalls, from simulate()'s real
  net consumption, base storage, plus (by default) any ship currently flying to that planet
- tools/state.py: tag each STORE entry with its planet (FIO AddressableId -> site SiteId) and
  each ship with its live flight origin/destination (keyed by ShipId, not StlFuelStoreId).
  Needed now that a 2nd base exists - storage/ship data was previously unscoped, which would
  have silently mixed bases' inventories together
- tests, docs updated (docs/library.md notes the multi-base tagging as a reusable pattern)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/roadmap.md

@@ -20,6 +20,8 @@ Legend: [ ] todo, [x] done. Build order matters; each step is usable on its own.
 13. [x] `tools/buy.py`: cash-aware shopping list (construction gap vs empire state's built count, plus N days of net operating stock via simulate(), priced at real fill cost, checked against cash/reserve).
 14. [x] `tools/sell.py`: ask-post-price + expected-clear-time advisor from 30d traded-volume percentiles, vs hitting the bids now.
 
+15. [x] `tools/runway.py`: days-of-runway per material from simulate()'s net consumption, base storage plus auto-detected inbound ship cargo (tools/state.py now tags each ship with its live flight origin/destination, and each STORE with its planet, needed once a 2nd base existed).
+
 12. [ ] `tools/portfolio.py`: choose the set of 1-building opportunities for one base that maximises total profit given shared whole-building housing (HB1/HB2/...), capex, permits and (for demolish-later) 60-day value decay. Persistence check exists (`tools/persistence.py`); wire it into the ranking.
 
 ## Open questions