ci: disable numa feature, bump obikmer, and document Sankoff costs

Disable the `numa` default feature in CI build and test steps to prevent container environment deadlocks, and add comments explaining the cache key salt bump (`v2`) to mitigate incremental compilation corruption. Document a 16-state Sankoff cost matrix derived from set-edit distances, including substitution, gain/loss, and context-disappearance costs compatible with TNT's interface. Bump `obikmer` crate version to 1.1.43.

src/Cargo.lock

@@ -1715,7 +1715,7 @@ dependencies = [
 
 [[package]]
 name = "obikmer"
-version = "1.1.42"
+version = "1.1.43"
 dependencies = [
  "clap",
  "csv",

src/obikmer/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "obikmer"
-version = "1.1.42"
+version = "1.1.43"
 edition = "2024"
 
 [[bin]]