## Why

Increase technical robustness by remediating the specific issues flagged by Chrome Lighthouse so the primary surface (homepage) can achieve a 100 score across categories.

Lighthouse sources:
- `C:\Users\simpl\Downloads\santhoshj.com-20260210T182644.json` (desktop)
- `C:\Users\simpl\Downloads\santhoshj.com-20260210T182538.json` (mobile)

## What Changes

- Fix accessibility contrast failures (WCAG AA) for card metadata and pill chips.
- Fix SEO hygiene issues:
  - `robots.txt` must reference a valid sitemap URL
  - eliminate non-crawlable anchor markup that Lighthouse flags (e.g., anchors without `href` in modal UI)
- Eliminate Best Practices "Issues" panel findings related to Content Security Policy.
- Improve Performance audits that prevent a perfect score, primarily on mobile:
  - optimize above-the-fold image delivery (thumbnails/covers)
  - reduce render-blocking resources (font CSS)
  - ensure CSS/JS delivery is optimized (minification and unused code reduction)
  - improve cache lifetimes where applicable for first-party assets, and mitigate third-party cache lifetime penalties where feasible.

## Capabilities

### New Capabilities
- `asset-delivery-optimization`: Ensure critical assets (CSS/fonts/images) are delivered in a Lighthouse-friendly way (minified, non-blocking where possible, and appropriately cached) and that mobile LCP is consistently fast.
- `security-headers`: Define and implement a CSP baseline and related headers that eliminate DevTools "Issues" panel findings without breaking third-party integrations.

### Modified Capabilities
- `wcag-responsive-ui`: Strengthen the baseline to explicitly require sufficient text contrast for secondary/muted UI text and pill/chip labels so the site passes Lighthouse contrast checks.
- `seo-content-surface`: Strengthen robots + sitemap correctness and require that link-like UI uses crawlable markup (valid `href` when an anchor is used).

## Impact

- Affected UI/CSS: card footer metadata (`.muted`) and pill styling; modal CTA markup.
- Affected SEO assets: `robots.txt` sitemap line.
- Affected security posture: CSP and related headers (may require changes to how third-party scripts are loaded).
- Affected performance: image source/size strategy for thumbnails/covers; font delivery strategy; CSS/JS build pipeline and cache headers.