fix(docs): repair the frameworks.svg comment and clarify the image footer

[FabianClemenz]

Summary

Two small fixes to the launch image, one cosmetic and one an actual defect.

1. frameworks.svg was not well-formed XML

When the generator script was dropped in #176, I added a header comment to the SVG documenting how to re-export the PNG. That comment contained uv run --group docs … — and XML comments may not contain a double hyphen, so the file stopped parsing.

Invisible on the site, which serves the PNG, and mkdocs build --strict never noticed because it treats the SVG as an opaque asset. But the file I documented as "the editable source" would not open in a browser or a vector editor. Found while re-rendering it.

The comment is rewritten without literal flags, spells the re-export out as Python instead, and says why:

Note: XML comments may not contain a double hyphen, so command line flags are
spelled out in prose above rather than shown literally.

xml.etree.ElementTree.parse() now accepts the file.

2. The footer arithmetic

The headline reads "Five frameworks. One diagram." while the footer listed six items:

SQLModel · SQLAlchemy · Django · Pydantic · dataclasses · SQL DDL

Both were defensible — SQL DDL is an input format, not a Python model framework — but a reader scanning a thumbnail counts the footer and sees a number that contradicts the headline. On an image whose job is to be trusted in two seconds, that is an own goal.

Now: … dataclasses · **and raw SQL DDL**. The "and" marks it as a different category, so the count reads as five frameworks plus something else.

The claim itself is still correct

Checked rather than assumed. MODEL_SOURCES is unchanged at exactly five, and every classification path returns one of them:

MODEL_SOURCES = ("sqlmodel", "sqlalchemy", "django", "dataclass", "pydantic")

--base-classes (#173) did not add a sixth: a ninja.Schema subclass is classified as pydantic. django-ninja support rides on an existing framework rather than being a new one, so "five" is right and "six" would have been wrong.

The README already says "5 Python Frameworks + SQL DDL" and the docs home says "five frameworks plus raw SQL DDL" — both precise. Only the image blurred the distinction.

Type of change

• Bug fix
• Documentation

Verification

xml.etree.ElementTree.parse() on the SVG succeeds (it did not before). PNG re-rendered at 1600×840 and inspected. mkdocs build --strict passes; full pre-commit run --all-files clean.

Checklist

• Tests added or updated for the change — n/a, docs asset
• uv run pytest passes locally
• uv run ruff check src/ tests/ and uv run mypy src/ pass
• Docs/README updated if behavior changed
• CHANGELOG.md updated under [Unreleased]