feat(dispatch): add auto dispatch strategy selectionHEADmain

Introduce automatic dispatch strategy selection with three
mutually-exclusive features: `dispatch_linear`, `dispatch_tree`,
and `dispatch_phf`. When none are enabled, the generator picks
the optimal strategy at compile time based on command table shape.

Add CHD minimal perfect hash generator, refactor trie fallback
into a shared method to keep generated code linear, and add a
benchmark harness to validate strategy selection.

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