feat: add repository guidelines and update contribution instructions

[QuantumExplorer]

This update introduces a new AGENTS.md file containing repository guidelines, including project structure, build and test commands, coding style, testing guidelines, commit and pull request guidelines, and security tips.

Additionally, the CONTRIBUTING.md file has been updated to reflect the new branching model and clarify the contribution workflow. The minimum supported Rust version (MSRV) has been updated to 1.89, and references to the previous MSRV have been removed.

These changes aim to provide clearer instructions for contributors and improve the overall organization of the repository.

Summary by CodeRabbit

• Documentation
  • Added a comprehensive repository guidelines document covering project structure, build/test commands, coding conventions, testing practices, security tips, and references.
  • Revamped the contribution guide with a modern branching model, GitHub-centric workflow, updated MSRV (1.89), coding/testing/security guidance, and streamlined PR/merge criteria.
  • Updated the main README: refreshed badges, set MSRV to 1.89+, introduced the branching model, simplified setup instructions, corrected repository paths, and pointed documentation links to the new site.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Adds AGENTS.md with repo-wide guidelines; rewrites CONTRIBUTING.md to a GitHub-centric workflow with updated MSRV and branching model; updates README.md badges, MSRV, branch policy, documentation links, and clone paths. No code or API changes.

Changes

Cohort / File(s)	Summary of Changes
New repository guidelines AGENTS.md	Introduces comprehensive guidelines on project structure, build/test commands, coding style, testing, commit/PR practices, security notes, and references.
Contribution process overhaul CONTRIBUTING.md	Replaces legacy guidance with modern fork-and-PR workflow, v**-dev branching model, MSRV 1.89, testing/linting expectations, security stance, unsafe code guidance, and CI/approval criteria.
Readme updates README.md	Updates badges, MSRV to 1.89+, links to documentation, branching model notes, clone paths, and contributor pointers to CONTRIBUTING.md and AGENTS.md.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10–15 minutes

Suggested reviewers

• ogabrielides

Poem

I thump my paws on docs so clean,
New paths to branch, a tidy sheen.
MSRV raised, the carrots gleam,
PRs hop light in reviewer stream.
With guidelines neat and warren-bright,
We ship at dusk—and test by night. 🥕✨

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📥 Commits

Reviewing files that changed from the base of the PR and between 46f94cc and fb14759.

📒 Files selected for processing (3)

• AGENTS.md (1 hunks)
• CONTRIBUTING.md (3 hunks)
• README.md (3 hunks)

✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch featadd-repository-guidelines

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