docs: add missing demo references for skyfire-kya and identity-a2a

[Sertug17]

Summary

Two demos exist in the repository but are missing from documentation:

1. Skyfire KYA demo missing from README.md

The root README.md lists 4 demos (identity, identity-a2a, payments, e2e), but package.json and AGENTS.md both include a 5th: demo:skyfire-kya. Added the Skyfire KYA demo section to the root README.

2. Identity A2A and Skyfire KYA demos missing from demos/README.md

The demos/README.md only lists 3 demos (identity, payments, e2e), missing both identity-a2a and skyfire-kya. Added both.

Files Changed

• README.md — Added Skyfire KYA demo section after End-to-End Demo
• demos/README.md — Added Identity A2A and Skyfire KYA demo sections

Summary by CodeRabbit

• Documentation
  • Updated project documentation with comprehensive demo guides
  • Added Skyfire KYA demo documentation with execution commands and source links
  • Added Identity A2A demo documentation with setup instructions and references
  • Expanded README with clear navigation to demo implementations

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: d6151a14-9153-47ce-9b52-d2a12172d223

📥 Commits

Reviewing files that changed from the base of the PR and between 6f65936 and d3097a3.

📒 Files selected for processing (2)

• README.md
• demos/README.md

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Walkthrough

This PR adds documentation for two new demos. README.md documents the Skyfire KYA demo and its integration with ACK-ID identity infrastructure. demos/README.md is expanded with entries for both Identity A2A and Skyfire KYA demos, including descriptions, run commands, and source code links.

Changes

Demo documentation

Layer / File(s)	Summary
Demo documentation for Identity A2A and Skyfire KYA README.md, demos/README.md	README.md adds a Skyfire KYA Demo subsection with purpose, command, and folder link. demos/README.md expands with Identity A2A demo (A2A-compatible agents using ACK-ID) and Skyfire KYA demo (KYA token integration), each with descriptions, pnpm commands, and code links.

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🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding documentation for two missing demo references (skyfire-kya and identity-a2a) in the README files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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