docs(agents): reduce duplication and add concise writing guidance

[LalatenduMohanty]

Reduce from 233 to 123 lines by removing content duplicated in CONTRIBUTING.md and using references instead. Add concise writing guidance as a top-level rule.

Closes: #879

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR streamlines AGENTS.md by consolidating and shortening guidance for AI agents. It replaces explicit “When to Read CONTRIBUTING.md” and “IMPORTANT” directives with an agent-specific prompt to consult CONTRIBUTING.md for standards and commit formats; tightens Essential Rules (conciseness, ask before large speculative changes, avoid inventing patterns); condenses command documentation (removed per-command commentary and Pre-commit Hooks, renamed sections to “Setup” and “File-Scoped” with simplified examples); trims Code Patterns and Commit Message sections to brief pointers; and normalizes wording and punctuation. Net change: +33 / -142 lines.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~22 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main changes: reducing duplication and adding concise writing guidance to AGENTS.md.
Description check	✅ Passed	The description clearly relates to the changeset, explaining the reduction in lines and consolidation of duplicated content while adding concise writing guidance.
Linked Issues check	✅ Passed	The PR directly addresses issue #879 by reviewing/updating AGENTS.md, reducing duplication with CONTRIBUTING.md, and adding concise writing guidance as a top-level rule.
Out of Scope Changes check	✅ Passed	All changes are scoped to AGENTS.md and align with issue #879's objectives of improving the document structure and adding actionable writing guidance.

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[rd4398]

Looks good to me!

[LalatenduMohanty]

@mergify rebase

[mergify]

rebase

✅ Branch has been successfully rebased

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@AGENTS.md`:
- Around line 102-110: Update the AI attribution footer in the AGENTS.md commit
example so it matches the repository's exact required string; replace the
existing "Co-Authored-By: Claude <claude@anthropic.com>" with the exact required
footer "Co-Authored-By: Claude <claudeanthropic.com>" in the example commit
block and ensure the surrounding guidance text still states to add that footer
when AI agents create or significantly modify code.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 520735a3-1086-45ec-a4ba-5a6d695cdb6f

📥 Commits

Reviewing files that changed from the base of the PR and between 12b15ee and c44e85d.

📒 Files selected for processing (1)

• AGENTS.md