feat(teams): place new team roles under their game's divider role

Auto-created team roles now land directly under the CS2 / LoL "divider" role
in the community guild's role list, keeping it grouped by game.

- config: CS2_DIVIDER_ROLE_ID / LOL_DIVIDER_ROLE_ID (season-specific, env
  overridable) exposed as TEAM_DIVIDER_ROLE_IDS keyed by game code.
- core/sheets: tag each team with its game (CS2/LoL) from the section title it
  sits under; shared _scan_sections generator feeds both parse_team_rosters and
  the new parse_team_games; get_game_for_team accessor + _team_game cache.
- core/member_sync: on creating a team role, position it at its game divider's
  slot (best-effort; left in place if game/divider unknown or move refused).
- .env.example + tests for game tagging and role placement.

Each participant is in exactly one game, so one role per team is unambiguous.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01R6JZkyszyDFuFtk25WBbcR

.env.example

@@ -14,6 +14,12 @@ SHEET_ID=your-google-sheet-id-here
 # the economy/community bot. Leave unset to disable team-role sync entirely.
 TEAM_SHEET_ID=
 
+# Team-section "divider" role IDs. A newly-created team role is positioned
+# directly under the divider for its game (CS2 / LoL). Season-specific - update
+# yearly. 0 = leave that game's new roles at the bottom of the role list.
+CS2_DIVIDER_ROLE_ID=
+LOL_DIVIDER_ROLE_ID=
+
 # Path to Google service account credentials JSON
 GOOGLE_CREDS_PATH=credentials.json