AGENTS.md causes instruction overload and context rot #9704

Summary

AGENTS.md has grown into a long, repetitive set of project rules, examples, and workflows. Its absolute instructions often apply only to particular changes, so agents spend context on irrelevant guidance, over-test, or lose track of the user's actual task. This creates context rot and makes agent work less reliable.

Details

Keep the project requirements, but make them concise, non-duplicative, and clear about when each rule applies. PR #9703 proposes a rewrite. This issue was drafted with Codex (GPT-6) from the user's diagnosis.