[amrit110]

Release 0.16.0. Merging this, then pushing tag v0.16.0, publishes to PyPI and creates the GitHub release (publish.yml).

• Added (feat: tabctx-mcp, tabular foundation models as tools for coding agents #84): tabctx-mcp, which gives coding agents TabPFN and TabICL as tools. It comes as an MCP server, a JSON CLI and a pi extension, installed with pip install "tabctx[mcp]". There's a churn demo with a web UI, and a hosted demo.
• Fixed (fix(serve): a Parquet file's pandas index is not a feature #85): a Parquet file's pandas index is no longer read as data.

Changes: the version in pyproject.toml and uv.lock, the CHANGELOG heading, and the README status line.

Checks:

• uv build makes tabctx-0.16.0 (wheel and sdist).
• In an environment like the publish workflow's (.[dev] only), the unit tests pass: 557 passed, 18 skipped.

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