docs/library.md: register puga.route and puga.planet in the module map

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

docs/library.md

@@ -45,6 +45,15 @@ EOF
 - **`puga.simulate`** — `simulate(plan, recipes, buildings, resources, fertility, price, ...)`:
   the PRUNplanner-simulator replica. Reuse this for anything plan-shaped rather than reimplementing
   efficiency/workforce/flows again.
+- **`puga.route`** — `load_graph()`, `resolve_system(query)` (planet/system natural id or name
+  -> SystemId), `shortest_path(src, dst, graph=None)` (Dijkstra by straight-line ly over FIO's
+  `/systemstars` jump graph; returns jumps, distance_ly, path). Not a PRUNplanner feature, built
+  for this project since travel isn't modelled anywhere else. CLI: `tools/route.py`.
+- **`puga.planet`** — `candidates(resource_ticker, min_factor=0.0)`: every planet with that
+  resource, sorted by extraction factor, each with temperature/pressure/gravity/fertility/faction
+  and `build_requirements` (FIO's own founding-cost materials for that specific planet — real
+  data, not guessed environment thresholds). CLI: `tools/planet.py`, pass `--from` an existing
+  base or pure-factor ranking is misleading (best-factor planets are often thousands of ly away).
 - **`puga.config`** — `get(key)` reads `.env`; `state_path()` returns the real
   `empire/state/company.yaml` if synced, else the tracked example.