Document getProperty export in treebark package README

[Copilot]

The getProperty function is exported from the main package but was undocumented in the README.

Changes

• Added API documentation section for getProperty with parameter types and return values
• Documented path syntax from most to least common:
  • Simple property access: "name", "age"
  • Nested properties: "user.name"
  • Array indices: "items.0"
  • Parent/grandparent context: "..parentProp", "../../grandProp"
• Added code examples demonstrating typical usage patterns

Example

import { getProperty } from 'treebark';

const data = {
  name: 'Alice',
  user: { profile: { email: 'alice@example.com' } }
};

getProperty(data, 'name');              // 'Alice'
getProperty(data, 'user.profile.email'); // 'alice@example.com'
getProperty(data, 'missing', [], undefined, 
  (path) => `default-${path}`);         // 'default-missing'

Original prompt

document the getProperty export in nodejs/packages/treebark readme

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