docs: update project status to Q4 Testnet

[rodrigooler]

Summary

Update project documentation to reflect Q4 Testnet phase with full roadmap transparency for the community.

Changes

1. README.md: Added Q4 Testnet disclaimer and 4-milestone roadmap
2. MEMORY.md: Documented Q1-Q3 achievements and Q4 status
3. AGENTS.md: Updated current phase to Testnet (Q4), M1 milestone active
4. CHANGELOG.md: Complete Q1-Q3 history for community transparency
5. .github/ISSUE_TEMPLATE/: Issue templates for M1 infrastructure

Q4 Roadmap

Milestone	Due	Issues
M1: Public Testnet Bootstrap	May 14, 2026	8
M2: External Agents Live	May 31, 2026	3
M3: Security Audit Submitted	June 14, 2026	4
M4: 30-Day Stability Checkpoint	June 29, 2026	4

Verification

• Documentation builds correctly
• All links verified
• English language throughout

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Part of Q4 Testnet Phase

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[cloudflare-workers-and-pages]

Deploying raxion with    Cloudflare Pages

Latest commit:	011521c
Status:	🚫  Build failed.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud