docs: add agent instruction entrypoints

[casper-phantom]

Note

Low risk: This documentation-only change does not alter SDK code or build configuration.

Summary

• Add repository-specific guidance for the Rust SDK workspace and its Swift, Android, and JavaScript bridges.
• Expose the same instructions through both standard root entrypoints by linking CLAUDE.md to canonical AGENTS.md.
• Document only validation commands already exercised by repository CI.

Agent provenance

• implementation: Oz — not exposed by host / not exposed by host

Casper-Issue-Key: juicebox-sdk/agent-instructions-symlink
casper-run-id: 01a015f1-7a8c-72c8-8f70-7536ff5bd926

Summary by CodeRabbit

• Documentation
  • Added repository guidance covering the SDK’s purpose, platform layout, CI requirements, validation commands, and README locations.
  • Added a linked reference for consistent access to the repository guidance.

[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: 3dac90cc-c7b5-4a04-8404-b13ce5101f83

📥 Commits

Reviewing files that changed from the base of the PR and between 6741fa6 and ec97d6a.

📒 Files selected for processing (2)

• AGENTS.md
• CLAUDE.md

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📝 Walkthrough

Walkthrough

Changes

Repository Guidance

Layer / File(s)	Summary
Repository guidance and AI tooling link AGENTS.md, CLAUDE.md	Added project layout, toolchain, validation, and documentation guidance. Added CLAUDE.md as a symbolic link to AGENTS.md.

Merge Risk: ⚪ Minimal · up to ec97d

This documentation-only change adds repository guidance and a linked entrypoint without changing SDK code or build configuration; no actionable merge-blocking risk remains.

🚥 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 clearly describes the documentation change that adds repository agent instruction entrypoints.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch casper/agent-instructions-symlink

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• Reviewed files: 2
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_{Comment @coderabbitai help to get the list of available commands.}

[casper-phantom]

Closing this rollout PR because the repository did not already have root AGENTS.md or CLAUDE.md guidance. We only want to add the reciprocal entrypoint where substantive instructions already exist.