chore: apply BRAND.md copy and remove duplicated brand guidelines

[boojack]

Before: docs/brand-guidelines.md called itself the single source of truth for brand copy, and the site used its copy: tagline "Catch a thought. Keep it yours." and description "Write short memos without titles or folders. Find them later by search, tag, or date."

After: BRAND.md in usememos/.github is the only brand definition. The duplicated guide is deleted, and the site uses BRAND.md's copy verbatim:

Surface	Copy
Homepage hero headline, default title, social image	Tagline: "Your thoughts, your data, shared on your terms."
Homepage hero text	Short
Default and homepage metadata, JSON-LD	One-liner: "Your own timeline for quick notes, private by default."
Docs introduction, FAQ "What is Memos?", llms.txt summary	Standard

How:

• src/shared/lib/branding.ts holds the four BRAND.md strings (BRAND_TAGLINE, BRAND_DESCRIPTION = One-liner, new BRAND_SHORT, new BRAND_STANDARD).
• docs/brand-guidelines.md deleted; AGENTS.md, README.md, DESIGN_SYSTEM.md and code comments now point to BRAND.md.
• The social image renders the tagline as one string, so it wraps to three lines instead of being cut off after two.
• The getting-started page drops the old intro sentence and starts with the install path.
• Kept as is: the homepage proof points and the homepage SEO title "Memos - Open-Source, Self-Hosted Note-Taking App" and keywords.
• Tests updated to the new strings. pnpm lint and pnpm test pass (290 tests). Checked the hero at 1440px and 390px and the social image locally.

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Reviewing files that changed from the base of the PR and between 360798d and 3e7a19b.

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• AGENTS.md

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Run ID: 6bb0fd4d-540b-4ec2-8925-deb3b454778a

📥 Commits

Reviewing files that changed from the base of the PR and between 39f854d and 360798d.

📒 Files selected for processing (22)

• AGENTS.md
• DESIGN_SYSTEM.md
• README.md
• content/docs/faq.mdx
• content/docs/getting-started.mdx
• content/docs/index.mdx
• docs/brand-guidelines.md
• scripts/smoke-test.mjs
• src/app/(public)/(site)/brand/page.tsx
• src/app/(public)/(site)/page.test.tsx
• src/app/(public)/(site)/page.tsx
• src/app/(public)/(site)/sponsors/page.tsx
• src/app/layout.tsx
• src/app/og/home/image.png/route.tsx
• src/features/ai-discovery/lib/llms-content.test.ts
• src/features/ai-discovery/lib/llms-content.ts
• src/features/editorial/lib/social-preview.ts
• src/features/marketing/components/hero-accent.test.tsx
• src/features/marketing/components/home-own-section.tsx
• src/features/marketing/data/features/data.ts
• src/shared/lib/branding.test.ts
• src/shared/lib/branding.ts

💤 Files with no reviewable changes (1)

• docs/brand-guidelines.md

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Walkthrough

The change updates shared brand constants and applies revised copy across the homepage, metadata, documentation, and content summaries. It removes the local brand-guidelines document and directs contributors to the external BRAND.md. It also adds contributor instructions to consult installed Next.js guides and notes that next dev regenerates the agent-rules block.

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to 36079

The reviewed changes update brand messaging without an established functional or operational regression. No actionable issue remains before merge.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 15 files. (6 skipped: 6…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main changes: applying the centralized BRAND.md copy and removing the duplicated local brand guidelines.
Description check	✅ Passed	The description directly explains the branding source change, deleted file, updated copy surfaces, implementation details, and validation results.
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.

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 15 files. (6 skipped: 6 unsupported.)

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