Improve README header with platform overview and navigation

[thebenignhacker]

Add nav links, motto, and 3-layer overview so users understand the full platform at a glance.

[github-actions]

Claude finished @thebenignhacker's task —— View job

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Security Review Complete ✅

Performed comprehensive security analysis of PR #37 against 12 security categories.

Checklist

• Read changed files and understand modifications
• Analyze for security vulnerabilities (12 categories)
• Document findings
• Provide findings count

Changes Summary

PR #37 modified README.md with documentation improvements:

• Updated tagline from "Scan codebases..." to broader "Cryptography as a service..."
• Added motto: "Life is hard but cryptography doesn't have to be."
• Added navigation links (Website, Crypto Census, Docs, SDK, Platform)
• Added 3-layer platform overview (CLI, SDK, Platform)
• Updated algorithm count from 80+ to 130+
• Updated Python SDK version reference from 1.4.2 to 1.4.3

Security Analysis Results

Categories Analyzed:

1. Injection vulnerabilities (SQL, command, path traversal): ✅ N/A - Documentation only
2. Authentication/authorization bypasses: ✅ N/A - No auth code
3. Insecure deserialization or eval usage: ✅ N/A - No code
4. Hardcoded credentials or secrets: ✅ PASS - No credentials found
5. SSRF or open redirect risks: ✅ PASS - All links reviewed:
   • https://cryptoserve.dev - Same-origin domain
   • https://census.cryptoserve.dev - Subdomain of same project
   • https://cryptoserve.dev/docs/ - Same-origin docs
   • #sdk-usage - Internal anchor link
   • #self-hosted-platform - Internal anchor link
   • All are legitimate, project-owned URLs or internal anchors
6. Cryptographic misuse: ✅ N/A - Documentation references only
7. Prototype pollution: ✅ N/A - No JavaScript code
8. ReDoS: ✅ N/A - No regex patterns
9. Command injection: ✅ N/A - No command execution code
10. Scoring/gating logic bugs: ✅ N/A - No logic functions
11. Filter predicate bugs: ✅ N/A - No filter predicates
12. Boolean expression bugs: ✅ N/A - No boolean logic

Findings

No security issues found.

This PR contains only documentation improvements to the README header. All changes are:

• Pure markdown formatting and text content
• Navigation links point to legitimate project-owned domains (cryptoserve.dev, census.cryptoserve.dev) or internal anchors
• No code, credentials, or executable content introduced
• Version number update (1.4.2 → 1.4.3) and algorithm count update (80+ → 130+) are informational only

The changes improve user navigation and provide a clearer platform overview without introducing any security risks.

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FINDINGS_COUNT=0

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[github-actions]

Manual review required. This PR did not meet auto-merge criteria:

• Security review found issues (findings: unknown)
• PR author 'thebenignhacker' is not in the trusted auto-merge list
• PR is too new (2 min < 5 min minimum)