Add end-to-end developer journey documentation for AnchorKit

[El-swaggerito]

Description

Difficulty: Expert

Type: Documentation

Summary

Create an end-to-end developer journey showing how AnchorKit modules work together from account diagnostics to payment readiness, anchor lifecycle, and escrow milestones.

Current Behaviour

Docs may explain modules separately without showing how a developer would use AnchorKit as a complete toolkit.

Expected Behaviour

AnchorKit should provide a coherent developer journey that links packages, examples, web UI, tests, and contribution areas.

Suggested Implementation

Create a guided walkthrough, architecture flow, code examples, UI references, test references, and roadmap notes.

Files or Areas Likely Affected

• docs/
• README.md
• examples/
• apps/web/
• packages/
• contracts/treasury-escrow/

Acceptance Criteria

• End-to-end developer journey is documented.
• Account diagnostics flow is included.
• Payment readiness flow is included.
• Anchor lifecycle flow is included.
• Escrow milestone flow is included.
• Examples and tests are linked.
• README links to the journey.

Additional Notes

This should help GrantFox contributors understand the purpose of the monorepo.

[CyberXpert607]

I have reviewed the description and I believe I can work on this if assigned
Thanks

[grantfox-oss]

🦊 GrantFox — @CyberXpert607 has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #40)
2. Your PR will be reviewed by the Axionvera maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@CyberXpert607's PR #193 was approved and merged by @El-swaggerito.

🏆 @CyberXpert607: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (188 total points). Track your full progress on GrantFox.

👏 Great work, @CyberXpert607! Keep contributing to Axionvera.