Add core encounter processing pipeline

Filter by game version, parse levels and rate variants across all
generations, aggregate encounters by pokemon+method, and build
parent/child route hierarchy. Also completes encounter method coverage
(73/73) and pokemon form mapping (1180/1181) with manual overrides.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tools/import-pokedb/import_pokedb/__main__.py

@@ -18,6 +18,7 @@ from pathlib import Path
 
 from .loader import load_pokedb_data, load_seed_config
 from .mappings import PokemonMapper, LocationMapper, build_version_map, map_encounter_method
+from .processing import filter_encounters_for_game, process_encounters, build_routes
 
 SEEDS_DIR_CANDIDATES = [
     Path("backend/src/app/seeds"),                # from repo root
@@ -141,8 +142,47 @@ def main(argv: list[str] | None = None) -> None:
 
     pokemon_mapper.report_unmapped()
 
-    # TODO: Processing pipeline (subtasks rfg0, gkcy)
-    print("\nMappings built. Processing pipeline not yet implemented.")
+    # Process encounters per game
+    print("\nProcessing encounters...")
+
+    games_to_process: list[tuple[str, str, int]] = []  # (vg_key, game_slug, generation)
+    for vg_key, vg_info in config.version_groups.items():
+        generation = vg_info.get("generation", 0)
+        for slug in vg_info.get("versions", []):
+            if target_game and slug != target_game:
+                continue
+            games_to_process.append((vg_key, slug, generation))
+
+    for vg_key, game_slug, generation in games_to_process:
+        print(f"\n--- {game_slug} ---")
+
+        # Filter encounters for this game
+        game_encounters = filter_encounters_for_game(pokedb.encounters, game_slug)
+        if not game_encounters:
+            print(f"  No encounters found in PokeDB data")
+            continue
+
+        print(f"  Raw encounters: {len(game_encounters)}")
+
+        # Process into grouped encounters
+        encounters_by_area = process_encounters(
+            game_encounters, generation, pokemon_mapper, location_mapper,
+        )
+        print(f"  Location areas with encounters: {len(encounters_by_area)}")
+
+        # Build route hierarchy
+        routes = build_routes(encounters_by_area, location_mapper)
+
+        # Stats
+        total_routes = sum(1 + len(r.children) for r in routes)
+        total_enc = sum(
+            len(r.encounters) + sum(len(c.encounters) for c in r.children)
+            for r in routes
+        )
+        print(f"  Routes: {total_routes}")
+        print(f"  Encounter entries: {total_enc}")
+
+    print("\nProcessing complete. Output not yet written (subtask gkcy).")
 
 
 if __name__ == "__main__":