docs: add agent instruction entrypoints

[casper-phantom]

Note

Low risk: This documentation-only change does not alter package source, native code, or build configuration.

Summary

• Add repository-specific guidance for the JavaScript package and native iOS and Android implementations.
• Record the existing Yarn build, test, lint, and example-app development workflows.
• Expose the canonical guidance through both root instruction filenames.

Agent provenance

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

Casper-Issue-Key: react-native-fast-image/agent-instructions-symlink
casper-run-id: 01a015f1-7a8c-72c8-8f70-7536ff5bd926

Summary by CodeRabbit

• Documentation
  • Added repository guidance covering project structure, dependency management, development commands, and validation workflows.
  • Added a linked reference for consistent contributor 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: fb669b42-486a-411c-95aa-e0eb65818f85

📥 Commits

Reviewing files that changed from the base of the PR and between ac0bbef and 50755c6.

📒 Files selected for processing (2)

• AGENTS.md
• CLAUDE.md

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📝 Walkthrough

Walkthrough

Added repository guidance for project structure, dependency management, development commands, native validation, and React Native version policy. Added CLAUDE.md as a symbolic link to AGENTS.md.

Changes

Repository guidance

Layer / File(s)	Summary
Development instructions and tool linkage AGENTS.md, CLAUDE.md	AGENTS.md documents repository structure, Yarn workflows, build and test commands, native validation, and React Native version policy. CLAUDE.md links to AGENTS.md.

Merge Risk: ⚪ Minimal · up to 50755

This documentation-only change adds repository guidance without altering package code, native code, or build configuration; no actionable merge-blocking risk remains after normal checks and review.

🚥 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 and concisely describes the addition of 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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_{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.