[docs] Unbloat Security Architecture documentation

[github-actions]

Summary

Reduced documentation bloat in docs/src/content/docs/introduction/architecture.mdx while preserving all essential technical information.

Metrics:

• Before: 794 lines
• After: 689 lines
• Reduction: 105 lines removed (13.2% reduction)

Changes Made

Condensed verbose sections and repetitive bullet-point lists into concise prose:

1. Isolation Properties - Reduced from 4 bullet points to a single comprehensive sentence
2. Detection Properties - Consolidated 7 bullet points and 3 sections into 2 clear sentences
3. Sanitization Properties - Converted large 7-row table into compact prose format
4. Observability - Streamlined from 5 bullet points + code examples to 2 sentences
5. Architecture Summary - Transformed 4 numbered items into flowing paragraph
6. Redaction Properties - Condensed 4 bullets + example + tip into single sentence

What Was Preserved

• ✅ All 8 Mermaid diagrams remain intact
• ✅ All technical accuracy and security details maintained
• ✅ All configuration examples (YAML, bash) preserved where essential
• ✅ All links to related documentation retained
• ✅ Complete security layers summary table unchanged

Screenshots

Issue: Unable to capture screenshots of the rendered documentation page. The Playwright browser in the GitHub Actions environment cannot access localhost:4321 due to network isolation restrictions:

• Server runs on IPv6 localhost (::1:4321)
• Browser connection blocked with ERR_BLOCKED_BY_CLIENT
• This appears to be a security restriction in the MCP Playwright server configuration

Workaround needed: Screenshots would require either:

• Exposing server on 0.0.0.0 instead of localhost
• Using a different screenshot tool with localhost access
• Deploying to a publicly accessible URL for screenshots

File Modified

• docs/src/content/docs/introduction/architecture.mdx

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