git:20260801.754b569 to git:20260804.96f8e1a

+ The brand has ONE authored source: `assets/logo/brandmark.svg` (issue #53 — a single-fill amber tower glyph, square, no text). The assets service mints every variant from it (PNG ladders, favicons, the black derivation, the social PNG) into the gitignored `.omega/assets`, and the web build bridges them to `/assets/images/brand/`. The config keys live in `config/omega.json5`: `brand.color` is the one hex the theme ramps compose from, `brand.images.brandmark`/`.social` point at the bridged paths. `tests/tower/brand.test.js` pins the svg's fill to `brand.color`, so the two cannot drift silently.

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