Expand AGENTS.md with current repo and reporting rules

.agent/checklists/change-safety.md

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+# Change Safety Checklist
+
+Use this before and after non-trivial changes.
+
+## Scope
+
+- [ ] I identified whether this touches backend, UI, security, Windows service, subscription/routing, testing/release.
+- [ ] I read the matching skill file.
+- [ ] I avoided unrelated rewrites.
+- [ ] I did not introduce a second source of truth.
+
+## Tauri boundary
+
+- [ ] New/changed Rust command has matching TypeScript wrapper.
+- [ ] DTOs are synchronized between Rust and TypeScript.
+- [ ] Error shape is structured and actionable.
+- [ ] Blocking work is not run on async runtime thread.
+
+## UX
+
+- [ ] User-visible actions are explicit.
+- [ ] Disabled states have reasons.
+- [ ] Pending changes are visible before apply.
+- [ ] Secrets are redacted.
+
+## Validation
+
+- [ ] Relevant frontend build/test was run or explicitly not run with reason.
+- [ ] Relevant Rust fmt/clippy/test was run or explicitly not run with reason.
+- [ ] Windows-specific behavior was not claimed unless tested on Windows.