refactor: remove equivalence class folding from entropy pipeline

Removes circular-reverse complement machinery and explicit k-mer canonicalization across the entropy pipeline. Frequency tallying and Shannon entropy computation now operate directly on raw k-mer values, eliminating prior score inflation and alignment-dependent artifacts while preserving orientation invariance. Updates build scripts to generate normalized lookup tables for k-mer lengths 1–6, restricts the public API to `EntropyTracker`, and bumps crate versions. Documentation is updated to reflect the simplified raw-value approach and revised module structure.

src/Cargo.lock

@@ -1711,7 +1711,7 @@ dependencies = [
 
 [[package]]
 name = "obikmer"
-version = "1.1.38"
+version = "1.1.39"
 dependencies = [
  "clap",
  "csv",