refactor: rename obikpartitionner crate to obikpartition

Update Cargo manifests, dependency paths, and Rust imports across the workspace to reflect the `obikpartitionner` to `obikpartition` rename. Synchronize architecture and implementation documentation with the new module structure. Fix minor syntax issues in test assertions to ensure compilation compatibility. No behavioral or API changes are introduced.

src/Cargo.lock

@@ -1600,7 +1600,7 @@ dependencies = [
  "indicatif",
  "ndarray",
  "obicompactvec",
- "obikpartitionner",
+ "obikpartition",
  "obikseq",
  "obilayeredmap",
  "obiread",
@@ -1626,7 +1626,7 @@ dependencies = [
  "obidebruinj",
  "obifastwrite",
  "obikindex",
- "obikpartitionner",
+ "obikpartition",
  "obikphylo",
  "obikrope",
  "obikseq",
@@ -1648,7 +1648,7 @@ dependencies = [
 ]
 
 [[package]]
-name = "obikpartitionner"
+name = "obikpartition"
 version = "0.1.0"
 dependencies = [
  "cacheline-ef",
@@ -1685,7 +1685,7 @@ dependencies = [
  "ndarray",
  "obicompactvec",
  "obikindex",
- "obikpartitionner",
+ "obikpartition",
  "obikseq",
  "obilayeredmap",
  "obipipeline",