Add automatic Android emulator startup and headless execution

[mdshakib007]

Summary

• Automatically reuse an existing Android emulator or launch an available AVD
• Add Android Headless execution using the emulator's no-window mode
• Share emulator lifecycle handling between UI launches and test execution
• Wait for ADB, Android boot, package manager, and System UI stability
• Detect System UI ANRs, capture diagnostics, safely select Wait, and retry with a cold boot when necessary
• Preserve emulator data by never automatically wiping an AVD
• Validate Appium and UiAutomator2 before installation instead of blindly reinstalling
• Improve Android SDK discovery, device selection, logging, and missing-tool errors
• Avoid secondary screenshot errors when no mobile driver exists
• Add emulator, Appium installer, device discovery, and screenshot regression tests

Testing

• Full Node test suite: 118 passed
• Focused Android/Appium suite: 22 passed

[riz-hossain]

🔎 ZeuZ PR Review

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Overview	Value
Agents	✅ 4 completed
Suggestions	💡 5

Agent breakdown

→ General Review

Status: ✅ Completed
Suggestions: 2 suggestions

I found one high-impact correctness issue in the new emulator startup path, plus a smaller robustness concern around runtime parameter parsing.

→ Security Review

Status: ✅ Completed
Suggestions: 0 suggestions

No security issues found in the PR diff. The changes improve emulator handling and remove several shell-string adb invocations without introducing an obvious auth, injection, or secret-handling regression.

→ Performance Review

Status: ✅ Completed
Suggestions: 1 suggestion

One performance concern: the new Android auto-launch path does extra device/emulator discovery work on every launch, which is avoidable in a hot path.

→ Testing Review

Status: ✅ Completed
Suggestions: 2 suggestions

The PR adds substantial Android auto-launch/emulator-selection logic, but the new launch and device-resolution paths do not appear to have direct regression coverage. Existing emulator-manager tests cover helpers, but not the integration points in BuiltInFunctions.py or the new mobile_execution wiring.

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