Tool contract 3.12.0

The daily series as readers (docs/reviews/2026-09-18-TIME-SERIES.md Part 7). Every daily series is keyed by the GAME day (10:00 UTC to 10:00 UTC, named for the date it starts on; docs: clocks#the-game-day), and every point carries its stamps: observed_at, profile_observed_at (null on a roster-only day), roster_observed_at (null when the roster never touched the row), source (api | elixir-bot) and kind.

• players_timeline: metrics grows to every column of the day row (best_trophies, donations_received, the lifetime block with king_tower_level, total_donations and the challenge and tournament counters, the Path of Legends standing, the seasonal trophies, arena_id, clan_tag, clan_rank, previous_clan_rank, game_last_seen_at); kind: daily | pre_reset | season_roll; progress_key (a Player.progress key or 'all') adds progress[]; applied.window carries the season fields; docs points at recording#daily-series.
• NEW TOOL clans_timeline: a clan's day series (clan_score, clan_war_trophies, members, donations_per_week, required_trophies) with the aggregates over that day's member rows (total_member_trophies, avg_member_trophies, members_seen) and, on request, the profile-derived ones (avg_member_wins, avg_member_collection_level, members_12000_plus, members_14000_plus, members_6_years_plus, members_collection_1000_plus); series_available_from; verbosity compact keeps the five clan metrics.
• NEW TOOL clans_members_timeline: every member the roster placed in the clan in the window (or player_tags, up to 50), one point per game day with the roster's metrics and any profile metric; limit on members with a maximum of 50; verbosity compact keeps each member's first and last point and the delta.
• clans_roster full verbosity gains per member years_played, account_age_days, badge_count and lifetime {as_of, best_trophies, battle_count, wins, losses, three_crown_wins, collection_level, king_tower_level, total_donations} from the latest profile poll, null for a member whose profile is not recorded.
• rankings_timeline's description says what the record holds: one snapshot a day since 2026-09-11 and only when the board moved.
• elixir_data_insights.players_with_snapshot counts players with a profile snapshot.

Additive.