feat: AGENTS.md ve .agents/skills/ ekle — calmkerneltr.github.io

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Summary

Adds AI agent guidance documentation for the CalmKernel static website repository. Documentation-only PR — no functional code changes.

Files added:

• AGENTS.md — Master reference covering project overview, directory structure, untouchable files, override strategy, dark mode rules, SEO requirements, KVKK compliance, i18n rules, CI pipeline, HTML page template, and common mistakes.
• .agents/skills/html-page-creation/SKILL.md — Step-by-step guide for adding new HTML pages with full meta/OG/hreflang/JSON-LD checklist.
• .agents/skills/i18n-sync/SKILL.md — TR/EN page synchronization rules, eşleme tablosu, and common pitfalls.
• .agents/skills/blog-post-creation/SKILL.md — Blog post creation workflow including BlogPosting JSON-LD, sitemap update, and index page card addition.
• .agents/skills/dark-mode-css/SKILL.md — .active-body prefix conventions, color palette, common CSS patterns, and !important usage guidelines.

All content is written in Turkish as requested.

Review & Testing Checklist for Human

• CSS load order in templates: The AGENTS.md page template (section 10) includes calmkernel-custom.css in the CSS load order, but index.html on main does not load this file — only blog pages do. Verify this is the desired canonical order for new pages, or if the template should match index.html's current pattern.
• Verify documented conventions match actual codebase patterns: Spot-check a few rules (e.g., hreflang x-default always pointing to TR, dark mode class names active-body/dark-mode, CSS variable names like --color-content-white) against the actual source files to confirm accuracy.
• Blog skill inline <style> guidance: The blog skill documents that blog pages use inline <style> for article CSS. Confirm this is the intended long-term pattern vs. extracting to a shared CSS file.

Notes

• This PR has zero runtime impact — it only adds Markdown documentation files.
• CI (html5validator + Lighthouse) should pass since no HTML/CSS/JS files were modified.
• Playbook and Knowledge drafts (website-content-update, theme-architecture, seo-checklist, cookie-consent-gdpr) were requested as session messages and will be delivered separately.

Link to Devin run | Requested by @ahm3t0t

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.