Stale pom.xml / repo-root pyproject wording after the move #6

Some text still describes the monorepo layout:

• src/arcadedb_embedded/__init__.py:10: "derived from the Maven pom". The version now comes from the engine jar name, via scripts/extract_version.py.
• tests/test_jar_provenance.py:3 and tests/test_wheel_platform_tag.py:142: same "pom" wording.
• pyproject.toml:41-43: the [tool.uv] comment mentions a "repo-root pyproject.toml". That file doesn't exist, and this repo's root is the package.
• The "next steps" that scripts/build.sh prints (uv run pytest from the repo root).

These are comments and messages only; behaviour is unaffected.

Found in the final review of the move from ArcadeData/arcadedb (#1).

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