The banners wear the logo's own mark, not an emoji

[Jammy2211]

Follow-up to #260 ("The boards wear their organ's logo"). That change gave every board a hero in its organ's colours, but put an emoji in the ring where the README's logo puts the mark — 🧠 for the Brain, 📋 for the Mind. Beside the real logo (a circuit brain of traced lines and nodes; a profile head with a check inside it) the emoji read as a cartoon of the mark rather than the mark.

What changed — board/_theme.py only

• MARKS — each organ's glyph as inline SVG line art traced off its logo.png: the ring (closed, or opened where the logo opens it), the glyph, and the small filled nodes the family draws with. All six boards are covered; the umbrella has no logo to sample, so its helix is drawn in the same language.
• Drawn, not embedded. These pages are single self-contained files read on phones over mobile data. A mark is 0.5–1.4KB of path data that inherits the accent and stays sharp at any size; the logo PNGs are 80–150KB each.
• Wordmark gradient — Brain runs blue → violet and Memory violet → purple in their logos. A new optional glow2 reproduces that, falling back to glow so the same CSS rule paints the flat four.
• The hairline-and-dot rule between wordmark and tagline: every logo carries one, the hero had none. It is the detail that reads as "same mark".
• Hero glow now sits behind the glyph instead of pouring off the top edge, and each hero lift drops about a third — the logos are near-black with a breath of colour.

The mark is 4.3rem → 5.6rem, roughly the logos' own mark-to-wordmark proportion.

Verification

• pytest tests/ -q — 449 passed.
• New contract tests: every declared board has a mark; marks are line art that takes the accent (no hard-coded fill, no emoji); the hero draws the mark and orders wordmark → rule → tagline; an unknown organ falls back to the umbrella's mark rather than an empty ring.
• Both live pages regenerated and screenshotted in light and dark, and compared against the five logo.png files. Nothing below the hero changes.

PyAutoMind carries the regenerated dashboard.html; merge this first, or the Mind's dashboard_refresh.yml will regenerate that page against the old theme.

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