Add CLAUDE.md for Claude Code guidance

[jakubuid]

Summary

• Add CLAUDE.md documentation file to help Claude Code instances work effectively with this codebase
• Includes build commands, architecture overview, testing instructions, and key conventions
• Provides high-level understanding of the four-layer SDK architecture

Test plan

• Verify CLAUDE.md file is properly formatted
• Confirm all build commands are accurate
• Review architecture description matches current codebase structure

🤖 Generated with Claude Code

[claude]

Claude finished @jakubuid's task in 1m 58s —— View job

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Review Complete

• Read CLAUDE.md file
• Verify project structure matches documented architecture
• Check SDK versions and technical specifications
• Verify sample apps and test commands
• Report findings

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Issue 1: Target SDK version mismatch between documentation and actual codebase

ID: claude-targetsdkver-a8f2
File: CLAUDE.md:114
Severity: MEDIUM
Category: documentation_accuracy

CLAUDE.md states "Target SDK: 35" but gradle/libs.versions.toml:12 defines targetSdk = "34". The actual target SDK configured in the project is 34, not 35.

Recommendation: Update CLAUDE.md line 114 to match actual configuration:

- Target SDK: 34

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Issue 2: product/pay/ module referenced but does not exist in codebase

ID: claude-pay-module-b7c3
File: CLAUDE.md:49
Severity: HIGH
Category: documentation_accuracy

CLAUDE.md architecture diagram lists "product/pay/ - Payment integration" in the PRODUCT LAYER, but this directory does not exist in the repository. Only product/walletkit/, product/appkit/, and product/pos/ exist.

Recommendation: Remove the non-existent pay module from the architecture diagram:

│  PRODUCT LAYER                                          │
│  product/walletkit/  - High-level wallet SDK            │
│  product/appkit/     - High-level dApp SDK (Compose UI) │
│  product/pos/        - Point of Sale                    │

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Automated Checks

✅ No external domain URLs detected
✅ No cache-control issues detected
✅ No workflow security issues detected

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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

[github-actions]

🤖 Auto Review Issue: Target SDK version mismatch between documentation and actual codebase

Severity: MEDIUM
Category: documentation_accuracy
Tool: Claude Auto Review

Recommendation: Update CLAUDE.md line 114 to match actual configuration:

- Target SDK: 34

[github-actions]

🤖 Auto Review Issue: product/pay/ module referenced but does not exist in codebase

Severity: HIGH
Category: documentation_accuracy
Tool: Claude Auto Review

Recommendation: Remove the non-existent pay module from the architecture diagram:

│  PRODUCT LAYER                                          │
│  product/walletkit/  - High-level wallet SDK            │
│  product/appkit/     - High-level dApp SDK (Compose UI) │
│  product/pos/        - Point of Sale                    │