docs(readme): brand the header, drop mermaid for a static diagram

[GentBajko]

Adds assets/: a keystone-arch mark, the wordmark outlined in Inter so it renders the same everywhere, and flow.svg in place of the mermaid fence. Each file carries a prefers-color-scheme block, so one asset covers light and dark; every shape also keeps a literal fill attribute as the fallback for renderers that strip the style.

The header is now logo, tagline, three metadata badges, and the Patreon and Buy Me a Coffee links. The nine-item numbered contents list collapses to a single row. Intro, diagram, and the two doc pointers are centered.

Mermaid went because GitHub hands it to a cross-origin iframe, which no wrapper in the README can position, and its stock palette fought the mark. docs/flows.md still uses it.

Summary by Sourcery

Refresh the README with branded assets and a static architecture diagram for a consistent presentation across renderers.

New Features:

• Add branded logo, mark, and architecture flow assets with light and dark rendering support.
• Add project metadata and supporter badges linking to Patreon and Buy Me a Coffee.

Enhancements:

• Rework the README header and introduction into a centered branded layout with a compact navigation row.
• Replace the README Mermaid diagram with a static SVG while retaining Mermaid diagrams in the flow documentation.

Documentation:

• Improve README presentation with centered introductory content, architecture overview, navigation links, and documentation pointers.

[sourcery-ai]

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[sourcery-ai]

Reviewer's Guide

The README opening is redesigned as a centered, branded header with metadata and support badges, while the Mermaid architecture diagram is replaced by theme-aware static SVG assets; Mermaid remains in docs/flows.md for detailed flow documentation.

File-Level Changes

Change	Details	Files
Replace the Mermaid README architecture diagram with static, theme-aware SVG assets.	Add flow.svg containing the README flow diagram. Add light/dark logo and mark SVG variants with embedded prefers-color-scheme handling and literal fill fallbacks. Keep Mermaid diagrams in docs/flows.md unchanged.	README.md assets/flow.svg assets/logo-dark.svg assets/logo.svg assets/mark-dark.svg assets/mark.svg
Rework the README opening into a centered branded landing header.	Add the centered logo, tagline, compatibility/format/license badges, and support links. Center the introductory copy, static diagram, contents navigation, and documentation links. Collapse the numbered nine-item contents list into a single inline row while preserving section targets.	README.md

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