chore: migrate rust/composite_query to icp-cli

- Replace dfx.json with icp.yaml using @dfinity/rust@v3.3.0
- Rename canisters: kv_frontend → caller, data_partition → callee
- Move each canister into its own subdirectory (caller/, callee/)
- Update workspace Cargo.toml to reference new members
- Rewrite caller/lib.rs: replace ic_cdk::api::management_canister with
  ic-cdk-management-canister crate, replace ic_cdk::api::call::call with
  ic_cdk::call::Call::bounded_wait pattern
- Add Makefile with 7 tests covering put, composite query get, get_update,
  null lookup, multi-partition routing, and lookup composite query
- Add rust-toolchain.toml with wasm32-unknown-unknown target
- Add rust-composite_query job to composite_query.yml workflow
- Delete legacy rust-composite_query-example.yml workflow
- Update README with icp-cli deploy instructions and architecture diagram

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: marc0olo

.github/workflows/composite_query.yml

@@ -6,6 +6,7 @@ on:
   pull_request:
     paths:
       - motoko/composite_query/**
+      - rust/composite_query/**
       - .github/workflows/composite_query.yml
 
 concurrency:
@@ -26,3 +27,17 @@ jobs:
           icp network start -d
           icp deploy --cycles 30t
           make test
+
+  rust-composite_query:
+    runs-on: ubuntu-24.04
+    container: ghcr.io/dfinity/icp-dev-env-rust:1.0.0
+    env:
+      ICP_CLI_GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - name: Deploy and test
+        working-directory: rust/composite_query
+        run: |
+          icp network start -d
+          icp deploy --cycles 30t
+          make test