docs: add CI runtime persistence note to shared agent instructions

[github-actions]

Summary

• add an Automation Runtime section to AGENTS.md
• clarify that runs are non-interactive, state is ephemeral between runs, and persistent outcomes must be captured via safe outputs

Why

Issue #292 requested an explicit reminder in shared prompts that automation runs are stateless unless output is persisted.

Testing

• make lint

• Fixes Copilot seems to do weird stuff #292

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What is this? | From workflow: Mention in Issue

Give us feedback! React with 🚀 if perfect, 👍 if helpful, 👎 if not. for issue #292

Summary by CodeRabbit

• Documentation
  • Added automation runtime documentation outlining how CI runs operate with ephemeral state and best practices for persisting results through safe outputs like comments, issues, and pull requests.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📝 Walkthrough

Walkthrough

This pull request adds documentation to AGENTS.md clarifying that automation runs execute in non-interactive CI environments with ephemeral state. It specifies that outcomes must be persisted through safe outputs like comments, issues, or pull requests rather than relying on local state that disappears after execution.

Changes

Cohort / File(s)	Summary
Documentation Updates AGENTS.md	Added "Automation Runtime" section documenting CI execution model with ephemeral state and the need to persist outcomes through safe outputs.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A rabbit hops through CI streams,
Where state dissolves like morning dreams,
Yet comments, issues, PRs remain—
Safe havens in the digital lane!

🚥 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 about CI runtime persistence to AGENTS.md.
Linked Issues check	✅ Passed	The PR adds documentation clarifying non-interactive execution and ephemeral state, directly addressing issue #292's root cause analysis objective and mitigation strategy.
Out of Scope Changes check	✅ Passed	The PR contains only documentation updates to AGENTS.md aligned with the objectives of investigating and mitigating the agent behavior issues described in #292.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch main-9c3d98580480d1b1

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