Implementation of the localize_examples tool.

Reads curated example snippets from priv/mcp/examples/<capability>.exs. Each file evaluates to a list of %{title, code, expected_output} maps. The code field is a literal Elixir source snippet — agents can copy it verbatim — and expected_output documents what iex> returns for that snippet.

The example files are reviewed under PR; runtime evaluation of the snippet doesn't happen here. The doctest-style runner in test/ checks that each snippet still produces the documented output.