feat(scripts): add readability tool + pre-warm textstat in deps

Adds scripts/readability — a Python tool that prints standard readability metrics (Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG, Coleman-Liau, ARI, Dale-Chall, Linsear-Write) for one input file or as a side-by-side comparison of two.

Self-contained via PEP 723 inline metadata: textstat is declared as the script's only dependency, and the `#!/usr/bin/env -S uv run --quiet --script` shebang lets uv resolve it on each invocation.

The Makefile `deps` target now also pre-warms textstat in uv's cache so the first interactive run is fast.

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