Contract 6.27.0

The player tools, after the Elixir Gym's first run on them (feedback #129-#134).

• players_search ranks an agent's own clan's members as clanmates and a whole-name match before a partial one, and serves total_matches and truncated (#129). Before, it ranked clanmates only through a person's claimed players, so an agent never saw its clan first.
• Deck-level modes on players_summary and battles_decks are event-aware: event battles are event, not casual. top_deck and best_deck come only from decks the player chose, and net_trophies is Trophy Road's alone (#130).
• war_day_wins and clan_cards_collected are described as what they are: frozen counters of the retired Clan Wars format, not lifetime war wins or donations (#131).
• top_deck and best_deck carry trophy_range and last_played_at, and a note says when their ladder ranges do not overlap (#132).
• players_collection fielded carries recent_mean_level (the last ten decided battles) beside the 30-day mean, with a note when they differ by a level. It also echoes the window behind it (#133, #134).
• players_summary echoes season and crosses with the shared note, and players_timeline takes season (#134).

Additive fields; corrected values (deck modes, net_trophies, clanmate ranking).