assets: add GoSentry wordmark logo (clock-dial variant)

Recommended variant from gosentry-logo.html: Space Grotesk SemiBold with
an amber "G", a clock-dial "o" (ring + hands), and petrol "Sentry". Ships
self-contained SVGs (glyphs outlined to paths, no font dependency) in
light/dark/mono plus transparent PNGs at 256-2048px, with a README and the
gen_logo.py/raster.py generators for reproducibility.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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# GoSentry logo
Recommended wordmark variant from [`../gosentry-logo.html`](../gosentry-logo.html):
**Space Grotesk SemiBold** with an amber **G**, a **clock-dial "o"** (ring + hands),
and a petrol **"Sentry"**. The dial sits exactly in the `o` slot, so the schedule /
"watch" theme lives inside the letters instead of a bolt-on icon.
## Colors
| token | hex | use |
|--------|-----------|-----------------------------|
| amber | `#F7A80C` | `G`, dial ring + hands |
| petrol | `#0A4A58` | `Sentry` (light background) |
| white | `#FFFFFF` | `Sentry` (dark background) |
## Files
Vector (self-contained — glyphs are outlined to paths, no font required):
- `gosentry-logo.svg` — transparent, petrol `Sentry` (for light backgrounds)
- `gosentry-logo-dark.svg` — transparent, white `Sentry` (for dark backgrounds)
- `gosentry-logo-mono.svg` — single-color petrol
Raster (transparent PNG, aspect ≈ 4326×1034 ≈ 4.18:1):
- `gosentry-logo-{256,512,1024,2048}.png` — petrol `Sentry`
- `gosentry-logo-dark-{256,512,1024,2048}.png` — white `Sentry`
## Regenerating
Requires `fonttools` and `matplotlib`, plus the Space Grotesk variable font
(SIL OFL) instanced to weight 600 as `SpaceGrotesk-600.ttf`:
```sh
python gen_logo.py # writes SVGs into ./out
python raster.py # writes PNGs into ./out
```
`gen_logo.py` (SVG) and `raster.py` (PNG) share the same layout + dial geometry,
so both outputs stay identical. Space Grotesk is licensed under the SIL Open Font
License; outlining its glyphs into a logo is permitted.