brand: argus mark, stack sans notch, lowercase header

[proofmancer]

Summary

• Inline ArgusMark SVG component (theme-aware via currentColor) replaces the placeholder amber dot in the header.
• Stack Sans Notch variable font wired via next/font/local and exposed as --font-sans through Tailwind v4 theme tokens.
• Header trimmed to just the mark + argus wordmark — dropped the "claude code workspace" subtitle and the "claude-code docs" nav link.
• README gets the amber mark and an MIT badge at the top.
• globals.css defaults to the dark palette (was light-with-dark-media-query) and uses Stack Sans + Geist Mono as the font stack.

Test plan

• pnpm dev and confirm the header renders the Argus mark + lowercase wordmark with Stack Sans applied
• Confirm body copy and headings inherit Stack Sans (not Arial fallback)
• Confirm README on GitHub renders the centered mark + badge

Summary by CodeRabbit

• New Features

  • Dark theme is now the default color scheme.

• Style

  • Updated typography with locally loaded fonts for improved performance.
  • Enhanced branding with refined visual mark and lowercase styling.

• Documentation

  • Updated README with improved header layout and branding presentation.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1f7aa424-c9e2-4400-b695-5e8e043207ba

📥 Commits

Reviewing files that changed from the base of the PR and between 3f94e2f and f5522e4.

📒 Files selected for processing (3)

• .github/workflows/ci.yml
• package.json
• pnpm-workspace.yaml

📝 Walkthrough

Walkthrough

This PR implements a cohesive visual branding refresh for the Argus application. It introduces a new SVG mark component, switches to dark theme defaults with a locally-sourced font stack, and updates the root layout and README to showcase the new branding identity throughout the application.

Changes

Branding and Styling Refresh

Layer / File(s)	Summary
ArgusMark SVG component src/components/ArgusMark.tsx	New React component that exports an inline SVG mark inheriting color via currentColor with optional className prop (default h-5 w-5) for sizing via Tailwind utilities.
Global CSS theme and typography src/app/globals.css	Root CSS switches to dark theme by default, updates --font-sans and --font-mono to reference new font-stack variables, and changes body font-family to the new stack with system sans fallbacks.
Layout branding and font integration src/app/layout.tsx	Root layout replaces Google Geist fonts with locally-loaded StackSansNotch via localFont, updates metadata.title to lowercase branding, and revises header markup to use ArgusMark component with new visual styling.
README branding update README.md	README header is reformatted with centered HTML, logo image, and badge block while preserving the same high-level app description content.

🎯 2 (Simple) | ⏱️ ~10 minutes

A mark so fine, with fonts so neat,
Dark themes and stacks make branding complete,
ArgusMark dances in every frame,
The Argus workspace now has its name! 🐰✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main changes: introducing the ArgusMark component, adopting Stack Sans Notch font, and converting the header to lowercase branding.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch brand-mark-and-font

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