Add Vision Plan Compiler

[trmxvibs]

Description:

Implement VisionPlanCompiler.

Responsibilities:

• Accept VisionTaskPlan from VisionIntentParser
• Validate execution order
• Ensure required context exists
• Mark plans executable/non-executable
• Detect invalid sequences

Examples:

Valid:
FOCUS_WINDOW -> CLICK_TEXT -> TYPE_TEXT -> VERIFY_STATE

Invalid:
TYPE_TEXT without CLICK_TEXT
VERIFY_STATE without target text

Requirements:

• Create plan_compiler.py
• Add compiler unit tests
• Preserve typed VisionTaskPlan models

Goal:

Create a validation layer between intent parsing and execution.