feat: add dispatch strategy features with auto-selection and benchmark

support

Add `dispatch_linear`, `dispatch_tree`, and `dispatch_phf` as mutually
exclusive features for selecting the command dispatch strategy. When no
strategy feature is enabled, an auto-selection heuristic picks the
optimal strategy based on command table characteristics (size, name
length, nesting depth).

Add the `bench_support` feature to compile all three generators for the
benchmark harness, and introduce `bench_cell!` to generate benchmark
cells comparing strategies.

The PHF generator uses a CHD minimal perfect hash for O(1) lookup
independent of table size, while the trie generator was refactored to
use a shared fallback method, keeping code size linear in table size.

1 files changed, 22 insertions, 0 deletions

diff --git a/mingling/src/features.rs b/mingling/src/features.rs
index 8a3ce75..3d9a382 100644
--- a/mingling/src/features.rs
+++ b/mingling/src/features.rs
@@ -86,6 +86,28 @@ pub const MINGLING_DEFAULT: bool = false;
 #[cfg(feature = "default")]
 #[allow(unused)]
 pub const MINGLING_DEFAULT: bool = true;
+/// Whether the `dispatch_linear` feature is enabled
+/// Current: `disabled`
+#[cfg(not(feature = "dispatch_linear"))]
+#[allow(unused)]
+pub const MINGLING_DISPATCH_LINEAR: bool = false;
+
+/// Whether the `dispatch_linear` feature is enabled
+/// Current: `enabled`
+#[cfg(feature = "dispatch_linear")]
+#[allow(unused)]
+pub const MINGLING_DISPATCH_LINEAR: bool = true;
+/// Whether the `dispatch_phf` feature is enabled
+/// Current: `disabled`
+#[cfg(not(feature = "dispatch_phf"))]
+#[allow(unused)]
+pub const MINGLING_DISPATCH_PHF: bool = false;
+
+/// Whether the `dispatch_phf` feature is enabled
+/// Current: `enabled`
+#[cfg(feature = "dispatch_phf")]
+#[allow(unused)]
+pub const MINGLING_DISPATCH_PHF: bool = true;
 /// Whether the `dispatch_tree` feature is enabled
 /// Current: `disabled`
 #[cfg(not(feature = "dispatch_tree"))]