docs: optimize slides.md for readability and presentation crispness

[Copilot]

The slides had accumulated verbosity, a broken slide boundary, typos, and a bloated security section that undermined scannability in a presentation context.

Bug fixes

• Missing --- separator before "Getting Started" — that slide was merged into "Learn More About Security"
• Typo: Compiled Action Yaml → Compiled Action YAML
• Grammar: Fetch latest TypeScript docs report findings → …and report findings in a comment.

Tightened copy

• Shortened closing quotes on SE→AE and Human Processes slides
• Removed blank lines between bullets in "CI to CA" (Marp renders these as large gaps)
• Dropped redundant subtitles on Evolution, Playwright, and Monitoring slides
• Rewrote run-on intro on CI/CD with GitHub Actions
• Removed generic marketing closing line from "Learn More About Security"

Security section overhaul (~50 lines removed)

• "Security Architecture" paragraph → 4 tight bullets
• Security Layers 1–4: removed double-header pattern, condensed each to two focused prose lines
• "Security Features Summary" 6-section bullet block → compact summary table:

Layer	Protection
Containers	VMs + sandboxes for agent, MCP servers, skills
Network	Proxy/firewall at every layer, domain allowlisting
Permissions	Read-only default, safe outputs for writes
Supply Chain	Pinned action SHAs, protected CI/CD files
GitHub Guard	min-integrity, secrecy & integrity metadata
Monitoring	Threat detection, audit logs, run analysis

Content gaps filled

• "Useful Sandboxes: The Philosophy" was a heading-only slide — added a grounding quote
• Trimmed Playwright prompt from 5 steps to 4 (combined regressions + responsive check)

Original prompt

Review the slides.md and optimize for readability, presentation crispness.

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[Copilot]

Pull request overview

This PR refines the Marp slide deck for clearer presentation delivery by fixing a slide boundary issue, correcting typos/grammar, and tightening/condensing verbose sections (notably the security portion).

Changes:

• Fixes a missing --- slide separator so “Getting Started” renders as a separate slide.
• Tightens wording and formatting across multiple slides (quotes, bullet spacing, subtitles, and a CI/CD intro sentence).
• Condenses the security section substantially, including replacing a long feature list with a compact summary table.

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