Draw the card with a command instead of a browser

The card a shared link unfurls to was a picture of the models with no title on
it, and the models on it were too small to tell apart. Both are fixed, but the
part worth writing down is how.

The first attempt was an HTML page composed in the site's own fonts and
screenshotted. It looked right and it was wrong: the model count on it becomes
a picture of a number the moment the shutter closes, and `check-docs.ts`
cannot read a picture. That is the exact failure that check exists for — the
READMEs claimed 27 models when there were 37 — and a card is the worse place
to have it, because nobody reading one can see the kit to know it is stale.

So `bun run cover:build` counts the catalogue and draws the numbers it counted.
`site:build` runs it, which means the published card cannot be older than the
models it shows, and the day a model is added the card says 38 without anyone
remembering to make it.

Drawing type needed type. `scripts/text.ts` reads the outlines out of a `.ttf`
and fills them with a scanline pass — four sub-scanlines a row with exact
horizontal coverage, which is more code than sampling a 4x4 grid and visibly
better at the 16px the two mono lines are set in. It is deliberately partial:
format 4 cmap, simple and composite outlines, advances, no kerning or shaping.
What it cannot draw it throws on, because a headline missing a letter is not
something you notice before it is published. Archivo and IBM Plex Mono come
with it under the OFL, the same two faces the site is set in.

The renderer moved to `scripts/raster.ts` so the card and the contact sheet
draw from the same code and cannot disagree about what a barrel looks like;
`render.ts` is now the command line over it, unchanged in what it does. Its
one new flag is `--ground`, a flat background instead of the per-cell
gradient: forty gradients side by side read as banding, and on the page's own
ink the models float on the card as one field instead of sitting on it as a
grey slab.

Ten columns by four, because 1.91:1 and 37 models want 40 cells and at that
shape the cells come out square, which is what lets a barrel look like a barrel
at 116 pixels. The last row is centred — three empty cells left flush is a
notch in the corner, and a short row centred is how a contact sheet ends.

Byte-identical across runs, so it does not churn the diff on every build.

media/fonts/OFL.txt

@@ -0,0 +1,94 @@
+Copyright 2020 The Archivo Project Authors (https://github.com/Omnibus-Type/Archivo)
+Copyright © 2017 IBM Corp. with Reserved Font Name "Plex"
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
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+OTHER DEALINGS IN THE FONT SOFTWARE.