[Aionw]

Description

Implements one Phase 2 module migration from RFC #3534:

• moves the Store REST service implementation to the canonical python/mooncake/mooncake_store_service.py source root;
• moves its directly owned API tests to python/tests/store and removes both old tracked locations;
• preserves the public mooncake.mooncake_store_service import and mc_store_rest_server command;
• updates the transitional setuptools wheel staging script, direct CMake install input, legacy installation smoke checks, ownership/labeling, packaging contracts, and the archived deployment source reference;
• adds source-tree and isolated installed-wheel coverage for the canonical module and console entry point.

This is part of #3534 and does not perform any Phase 3 native-extension rename or Phase 4/5 release cutover.

Overlap with open work

• [Store] Migrate lightweight Python utilities to unified package #3586 owns mooncake_config.py; this PR deliberately leaves that module at the location on main and keeps the existing from mooncake.mooncake_config import MooncakeConfig contract. The PRs touch the same CMake install block, wheel staging script, packaging tests, CODEOWNERS, and labeler configuration, but migrate distinct files.
• [Reshard] Migrate to unified Python package #3585 and the other open Phase 2 module migrations ([PG] Migrate Python loader to unified package #3623, [Store] Migrate async Python client to unified package #3624, [TransferEngine] Migrate shared segment to unified Python package #3625, [Wheel] Migrate Python CLI modules to unified package #3626, [Wheel] Migrate DataProto catalog to unified Python package #3627, [Integration] Migrate allocators to unified Python package #3628, and [Integration] Migrate vLLM modules to unified Python package #3629) also touch shared transition surfaces such as scripts/build_wheel.sh, packaging checks, ownership, and labels. None owns the Store REST service implementation or tests.
• [Reshard] Migrate to unified Python package #3585 (Reshard) and [Store] Migrate lightweight Python utilities to unified package #3586 (Store utilities/config) remain out of scope and are not duplicated here.

Module

• Transfer Engine (mooncake-transfer-engine)
• Mooncake Store (mooncake-store)
• Reshard (mooncake-reshard)
• Mooncake EP (mooncake-ep)
• Mooncake PG (mooncake-pg)
• Integration (mooncake-integration)
• P2P Store (mooncake-p2p-store)
• Python Wheel (mooncake-wheel)
• Common (mooncake-common)
• Mooncake RL (mooncake-rl)
• CI/CD
• Docs
• Other

Type of Change

• Bug fix
• New feature
• Refactor
• Breaking change
• Documentation update
• Performance improvement
• Other

How Has This Been Tested?

Test commands:

python -m pytest -q python/tests/store/test_mooncake_store_service_api.py python/tests/packaging/test_project.py
python -m pytest -q python/tests/packaging
CMAKE_BUILD_PARALLEL_LEVEL=128 python -m build --wheel --outdir /tmp/mooncake-store-service-dist
MOONCAKE_TEST_WHEEL=/tmp/mooncake-store-service-dist/mooncake_transfer_engine-0.3.12.post1-cp310-cp310-linux_x86_64.whl python -m pytest -q python/tests/packaging/test_installed_wheel.py
python -m twine check /tmp/mooncake-store-service-dist/mooncake_transfer_engine-0.3.12.post1-cp310-cp310-linux_x86_64.whl
python -m compileall -q python/mooncake/mooncake_store_service.py python/tests/store/test_mooncake_store_service_api.py python/tests/packaging/test_project.py python/tests/packaging/test_installed_wheel.py
bash -n scripts/build_wheel.sh scripts/test_installation.sh
pre-commit run --files $(git diff --name-only --diff-filter=ACMR origin/main...HEAD)

Test results:

• Unit tests pass (96 focused Store REST service and source-packaging tests)
• Integration tests pass (1 isolated installed-wheel smoke test; module import and mc_store_rest_server entry-point load succeed outside the repository)
• Manual testing done (wheel manifest contains mooncake/mooncake_store_service.py, omits legacy/test paths, and twine check passes)

Documentation validation gap: make html could not run because Sphinx is absent. The documented uv executable is blocked by snap confinement in this container, while the pip fallback expands into the multi-gigabyte Torch/CUDA documentation dependency set. The changed Markdown passes git diff --check, trailing-whitespace, EOF, codespell, and the other PR-scoped pre-commit hooks.

Checklist

• I have performed a self-review of my own code
• I have formatted my code using ./scripts/code_format.sh (no C/C++ source changes; Python and CMake formatting passed through pre-commit)
• I have run pre-commit on the files changed in this PR and all hooks pass
• I have updated the documentation (the only service document naming the old tracked source path)
• I have added tests to prove my changes are effective
• For changes >500 LOC: I have filed an RFC issue ([RFC]: Unify Mooncake's Python package, build, and release architecture #3534)

AI Assistance Disclosure

• No AI tools were used
• AI tools were used (specified below)

OpenAI Codex assisted with repository analysis, the scoped migration, test maintenance, packaging/build validation, and PR preparation. The human submitter remains responsible for reviewing, understanding, and defending every changed line.

[Icedcoco]

LGTM

This is a behavior-preserving Phase 2 source migration. The missing PEP 517 CI coverage is planned for the later RFC build/release work, and the isolated-wheel aiohttp check is covered by #3632, which is expected to land around the same time. These are transition gaps rather than blockers for this PR.