add agent instructions

AGENTS.md

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+# Agent Instructions
+
+These instructions are authoritative for work in this repository.
+
+## Product & UX
+- Always adhere to the latest Apple Human Interface Guidelines (iOS).
+- Always implement accessibility best practices (labels, traits, dynamic type, sufficient contrast).
+- On iOS, always use default system colors unless explicitly told otherwise (e.g., `.green`).
+- Use English as the primary language in the app and design with localization in mind from the start. Implement localization scaffolding for English, German, Spanish, and French.
+- Date/time conventions are fixed: Monday is the first day of the week. Do not vary by locale.
+- Units are always metric; do not use imperial units.
+
+## Privacy & Permissions
+- Follow the principle of least privilege. For sensitive access (e.g., contacts), always offer the user a choice between limited and full access when the platform supports it.
+
+## Engineering Standards
+- Always use SwiftUI when possible.
+- Git commit messages must start with a lower-case letter.
+- Prefer self-contained builds. The app should run on first launch without extra setup when feasible.
+- For iOS development, target the latest available iOS version when creating new projects.
+- For iOS project setup, use Team ID `NG5W75WE8U`.
+- Avoid accounts unless absolutely necessary. Prefer account-less flows; for iOS apps, use iCloud as a backend by default. If we go to web, discuss accounts explicitly.