fix: resolve cargo clippy warnings

Collapse nested if blocks into match arm guards in yaku.rs and use
RangeInclusive::contains in agari-python/src/lib.rs.

Author: rysb-dev

crates/agari-core/src/yaku.rs

@@ -491,27 +491,25 @@ pub fn detect_yaku_with_context(
                     let mut concealed_triplets = 0;
                     for meld in melds {
                         match meld {
-                            Meld::Koutsu(tile, is_open_meld) => {
+                            Meld::Koutsu(tile, is_open_meld)
                                 // A triplet is concealed if:
                                 // 1. It's not an open pon
                                 // 2. For ron, the winning tile did NOT complete this triplet,
                                 //    OR the winning tile could have completed a sequence instead
-                                if !is_open_meld {
-                                    if context.win_type == WinType::Tsumo {
-                                        concealed_triplets += 1;
-                                    } else if let Some(wt) = context.winning_tile
-                                        && (*tile != wt || winning_tile_completes_sequence)
-                                    {
-                                        concealed_triplets += 1;
-                                    }
-                                }
-                            }
-                            Meld::Kan(_, kan_type) => {
-                                // Closed kans count as concealed triplets
-                                if !kan_type.is_open() {
+                                if !is_open_meld =>
+                            {
+                                if context.win_type == WinType::Tsumo {
+                                    concealed_triplets += 1;
+                                } else if let Some(wt) = context.winning_tile
+                                    && (*tile != wt || winning_tile_completes_sequence)
+                                {
                                     concealed_triplets += 1;
                                 }
                             }
+                            // Closed kans count as concealed triplets
+                            Meld::Kan(_, kan_type) if !kan_type.is_open() => {
+                                concealed_triplets += 1;
+                            }
                             _ => {}
                         }
                     }

crates/agari-python/src/lib.rs

@@ -75,7 +75,7 @@ fn valid_chi_combinations(hand: Vec<u8>, discarded_tile: u8) -> PyResult<Vec<(u8
         combos.push(((d - 2) as u8, (d - 1) as u8));
     }
     // Discarded tile is the MIDDLE of sequence: (d-1, d, d+1)
-    if val >= 1 && val <= 7 && hand[d - 1] > 0 && hand[d + 1] > 0 {
+    if (1..=7).contains(&val) && hand[d - 1] > 0 && hand[d + 1] > 0 {
         combos.push(((d - 1) as u8, (d + 1) as u8));
     }
     // Discarded tile is the LOW end of sequence: (d, d+1, d+2)