docs: add AGENTS.md for AI agent guidance

Add comprehensive AI agent instructions following Home Assistant
custom component best practices. Includes project overview,
code structure, development workflow, validation commands,
and quality standards.

Also update Python version to 3.12+ (required by Home Assistant 2025.1.4).

Author: GuyKh

.ruff.toml

@@ -1,6 +1,6 @@
 # The contents of this file is based on https://github.com/home-assistant/core/blob/dev/pyproject.toml
 
-target-version = "py310"
+target-version = "py312"
 
 lint.select = [
     "B007", # Loop control variable {name} not used within loop body

AGENTS.md

@@ -18,7 +18,7 @@ This is a Home Assistant custom component for the Israel Electric Corporation (I
 
 ## Tech Stack
 
-- **Python**: 3.10+
+- **Python**: 3.12+
 - **Home Assistant**: 2025.1.4+
 - **iec-api**: 0.5.3 (Python client for IEC API)
 - **Linting**: ruff (with Home Assistant rules)
@@ -67,6 +67,21 @@ logger:
 - Terminal where `./script/develop` runs
 - `config/home-assistant.log`
 
+## Workflow
+
+### Starting New Work
+
+**When starting a new task, always ask the user first:**
+- Should I switch to `main` branch and rebase?
+- Or should I work from the current branch?
+
+Then checkout a new feature branch before beginning work. Never work directly on `main` or stale branches.
+
+### Branch Naming Convention
+- Features: `feature/description`
+- Bug fixes: `fix/description`
+- Documentation: `docs/description`
+
 ## Code Style
 
 **Python:**