refactor(tools): rename rhema-tools-contract to rhema-claw-tools-contract

The crate binds the claw to its client tools, not tools at large,
so it carries the claw's name: package, lib and dep names, the
mock's binary, and the conformance suite's use paths. Specs and
README follow. The tools/contract directory keeps its name, and
no reference to the old name remains.

tools/Cargo.lock

@@ -466,8 +466,8 @@ version = "0.1.0"
 dependencies = [
  "axum",
  "clap",
+ "rhema-claw-tools-contract",
  "rhema-tools-common",
- "rhema-tools-contract",
  "serde",
  "serde_json",
  "tokio",
@@ -525,18 +525,7 @@ dependencies = [
 ]
 
 [[package]]
-name = "rhema-tools-common"
-version = "0.1.0"
-dependencies = [
- "rhema-tools-contract",
- "serde",
- "serde_json",
- "thiserror",
- "ureq",
-]
-
-[[package]]
-name = "rhema-tools-contract"
+name = "rhema-claw-tools-contract"
 version = "0.1.0"
 dependencies = [
  "serde",
@@ -544,6 +533,17 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "rhema-tools-common"
+version = "0.1.0"
+dependencies = [
+ "rhema-claw-tools-contract",
+ "serde",
+ "serde_json",
+ "thiserror",
+ "ureq",
+]
+
 [[package]]
 name = "ryu"
 version = "1.0.23"