meta: Migrate AI agent rules to AGENTS.md format (#3078)

### Description

Migrate AI agent rules from Cursor-specific format to the standardized
AGENTS.md format, enabling compatibility with Claude Code, Cursor, and
60+ other AI coding tools.

The existing rules were Cursor-only, requiring workarounds for Claude
Code. AGENTS.md is an open standard that allows a single set of rules to
work everywhere. Directory-scoped files replace glob patterns through
proximity matching (nearest AGENTS.md to edited file wins).

Considered maintaining separate rule files for each tool but that would
require duplicating content and keeping them in sync. The AGENTS.md
format is identical to Claude Code's CLAUDE.md format, so a symlink
provides native Claude support without duplication.

### Issues

N/A

Co-authored-by: Claude Sonnet 4.5 <[email protected]>

Author: szokeasaurusrex

.cursor/rules/rule-management.mdc

@@ -1,9 +1,3 @@
----
-description: CI/CD workflow patterns and conventions for sentry-cli
-globs: .github/workflows/**/*
-alwaysApply: false
----
-
 # CI/CD Workflow Guidelines
 
 ## Security: Pin Actions by Commit Hash
@@ -13,11 +7,11 @@ alwaysApply: false
 Example:
 
 ```yaml
-# ✅ CORRECT - Pinned by hash with version comment
+# Correct - Pinned by hash with version comment
 - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # 5.0.0
 - uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # 4.6.2
 
-# ❌ INCORRECT - Using version tag
+# Incorrect - Using version tag
 - uses: actions/checkout@v4
 - uses: actions/[email protected]
 ```

.cursor/rules/cicd-patterns.mdc .github/workflows/AGENTS.md.cursor/rules/cicd-patterns.mdc renamed to .github/workflows/AGENTS.md

@@ -1,8 +1,3 @@
----
-description: Core development guidelines and context for sentry-cli
-alwaysApply: true
----
-
 # Sentry CLI Development Guidelines
 
 ## Project Overview
@@ -65,4 +60,21 @@ Reference: https://develop.sentry.dev/engineering-practices/commit-messages/
 - Test fixtures in `tests/integration/_fixtures/`
 - Cross-platform testing via CI matrix
 
+## Code Formatting
+
+**ALWAYS** run `cargo fmt` before committing any Rust code changes to ensure consistent formatting across the codebase.
+
+## Updating These Guidelines
+
+Update AGENTS.md files when you encounter **generally applicable** patterns:
+- Development patterns and best practices
+- Common pitfalls and architecture decisions
+- Workflow improvements and tool configurations
+
+**Do NOT capture**: Task-specific fixes, temporary workarounds, personal preferences.
+
+**Keep AGENTS.md files as concise as possible to minimize token usage.**
+
+---
+
 Remember: This is a production tool used by many developers. Changes should be well-tested, backward-compatible, and follow established patterns.

.cursor/rules/sentry-cli-project.mdc AGENTS.md.cursor/rules/sentry-cli-project.mdc renamed to AGENTS.md

@@ -0,0 +1 @@
+AGENTS.md

CLAUDE.md

@@ -0,0 +1 @@
+../src/AGENTS.md

CLAUDE.md

@@ -1,9 +1,3 @@
----
-description: JavaScript/TypeScript development patterns for sentry-cli npm wrapper
-globs: js/**/*,scripts/**/*,package.json,*.js
-alwaysApply: false
----
-
 # JavaScript Development Guidelines
 
 ## Code Organization

apple-catalog-parsing/AGENTS.md

@@ -0,0 +1 @@
+../lib/AGENTS.md

.cursor/rules/javascript-development.mdc lib/AGENTS.md.cursor/rules/javascript-development.mdc renamed to lib/AGENTS.md

@@ -1,9 +1,3 @@
----
-description: Rust development patterns and conventions for sentry-cli
-globs: *.rs,Cargo.*,.cargo/**/*,src/**/*,apple-catalog-parsing/**/*
-alwaysApply: false
----
-
 # Rust Development Guidelines
 
 ## Code Organization