docs: add AI coding agent developer guide

[hajnalmt]

Summary

• Adds AGENTS.md with a comprehensive developer guide for AI coding agents working on the Volcano codebase
• Covers build commands, testing, code style guidelines (imports, naming, error handling, comments, formatting), code generation, commit message format, linter configuration, and key directory structure
• Updates .gitignore accordingly

Motivation

Providing AI coding agents with structured project context enables them to produce code that follows Volcano's conventions consistently, reducing review friction and improving contribution quality.

[hajnalmt]

@codex What do you think?

[chatgpt-codex-connector]

To use Codex here, create an environment for this repo.

[hajnalmt]

done please try again.
@codex

[chatgpt-codex-connector]

Summary

• Added a new Pull Request Follow-Up Workflow section to AGENTS.md with a 5-step process for handling comment-triggered iteration (trigger-first reading, latest review/CI validation, incremental updates, scoped validation, and clear reporting). AGENTS.mdL400-L412
• Updated .gitignore to ignore local Codex environment metadata under .codex/, reducing risk of accidental commits from local setup files. .gitignoreL147-L148

Testing

• ✅ git diff --check
• ✅ git status --short
• ✅ git commit -m "docs: clarify PR follow-up workflow for agents" -m "Add a short follow-up workflow section to AGENTS.md so Codex-style\ncomment triggers are handled consistently with current CI and review\ncontext. Also ignore local .codex metadata directories to prevent\naccidental commits from environment setup steps.\n\nFixes #N/A"

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