chore(deps): add zstandard cache prerequisite

[ayhammouda]

Summary

• Add zstandard>=0.23.0 as the explicit prerequisite for issue [v0.3.0] cache — add zstd codec layer to the retrieved-docs cache #46.
• Refresh uv.lock.
• Confirm the import works before requeueing the zstd cache codec implementation.

Validation

• uv lock
• uv run python -c "import zstandard; print(zstandard.__version__)" → 0.25.0
• uv run ruff check src/ tests/
• uv run pyright src/
• uv run pytest --tb=short -q → 298 passed
• uv run python-docs-mcp-server doctor

CodeRabbit review

Pending.

Why this approach

Issue #46 explicitly listed this dependency as the maintainer/Vision prerequisite before agent implementation.

Why this triggered supervisor review

Touches pyproject.toml dependency metadata and uv.lock; Vision is applying the delegated supervisor decision so #46 can proceed.

[coderabbitai]

Important

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-zstandard-prereq

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