feat: initial release of ARTEMIS Android Agent & Automation Platform

ARTEMIS is an autonomous multimodal Android agent and mobile UI automation
platform engineered for physical devices and emulators. It combines state-of-the-art
multimodal Vision-Language Models (VLMs) with hierarchical closed-loop planning,
resilient self-healing, and deep Android subsystem integration.

Key Features & Architectural Highlights:
- Dual-Engine Orchestration:
  * Pro Engine: Multi-agent closed-loop (Planner -> Operator -> Validator/Failure Analyzer -> Summarizer) powered by LangGraph.
  * Flash Engine: Ultra-fast reactive loop for deterministic, low-latency UI execution (<35 steps).
- Multimodal Perception & Grounding:
  * Hybrid visual screenshot grounding, real-time OCR extraction, and XML accessibility hierarchy parsing.
  * Dynamic-First, Coordinate-Fallback locating strategy for maximum resilience against UI drift.
- Autonomous Self-Healing & Diagnostics:
  * Failure analyzer and safety net for popup dismissal, crash recovery, and auto-retry.
  * Diagnostic sub-agents for log analysis, video recording inspection, and object detection.
- Unified CLI & Python SDK:
  * Rich CLI with commands: init, doctor, run, trace, batch, bench, server, and mcp.
  * Fluent Python SDK with Pydantic structured output models and package locking.
- Multi-Provider LLM Architecture:
  * Support for Google Gemini, OpenAI, Anthropic Claude, Vertex AI, OpenRouter, xAI Grok, and local endpoints (Ollama/vLLM).
  * Centralized configuration in config/artemis.jsonc.
- Native MCP & Observability:
  * Model Context Protocol (MCP) server endpoints for AI IDEs.
  * Full trace recording with before/after screenshots, action overlays, and execution replays.

Change-Id: I430b93ee2b76b54cc5a3c6eeccd15d2cf29830a1

artemis/agents/explorer/constants.py

@@ -0,0 +1,72 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Constants and prompt templates for the UI Explorer agent."""
+
+EXPLORE_DESCRIPTIONS = {
+    "flash": {
+        "description": (
+            "[EXPLORER] Call this to ask the UI Explorer agent to "
+            "locate coordinates on the screen layout by object detection."
+        ),
+        "query_description": (
+            "Pipe-separated list of target element descriptions, semantic"
+            " action terms, or color descriptors to search for concurrently"
+            " (e.g., 'red settings button | gear icon')."
+        ),
+        "rule_prompt": (
+            "Use the explorer tool to quickly check for visual icons, buttons, or text by name."
+        ),
+    },
+    "pro": {
+        "description": (
+            "[EXPLORER] Call this to ask the UI Explorer agent to locate"
+            " coordinates on the screen layout by executing XML, OCR,"
+            " coordinate search, and object detection."
+        ),
+        "query_description": (
+            "The target element or information to search for, including descriptions."
+        ),
+        "rule_prompt": (
+            "Call the explorer tool to search, OCR, or inspect it (maximum {max_iterations} tries)."
+        ),
+        "version_prompt": (
+            "You are running with a maximum of {max_iterations} turns: on your"
+            " final turn, you will receive a warning reminding you to call"
+            " submit_answer."
+        ),
+    },
+    "ultra": {
+        "description": (
+            "[EXPLORER] Full visual reasoning agent. Deeply inspects screen"
+            " regions and utilizes all perception/pixel-level tools with a high"
+            " execution limit (up to {max_iterations} turns) for"
+            " high-difficulty or layout-critical tasks."
+        ),
+        "query_description": (
+            "The target element or information to search for, including descriptions."
+        ),
+        "rule_prompt": (
+            "For highly complex visual searches, details validation, or layout"
+            " verification, invoke the explorer tool to perform multi-turn"
+            " visual reasoning and detailed coordinate checks (maximum"
+            " {max_iterations} tries)."
+        ),
+        "version_prompt": (
+            "You are running with a maximum of {max_iterations} turns: on your"
+            " final turn, you will receive a warning reminding you to call"
+            " submit_answer."
+        ),
+    },
+}