Add ~> context operator for implicit context binding

[Copilot]

This PR adds support for the ~> context operator, which allows using the left-hand context to transform the input on the right. This operator is similar to with statements or binding contexts from functional programming languages.

What's Changed

The ~> operator provides a concise way to access properties within a context without repeating the context variable name. For example:

PainPoint {
  name
  description
  impact: 1..10      // how much this hurts when it happens
  frequency: 1..10   // how often this happens
}

UserStory {
  name
  description
  painPoint
  // The following is equivalent to:
  // priority = painPoint.impact * painPoint.frequency
  priority = painPoint ~> impact * frequency
  functionalRequirements
  mockups
  phases
}

Implementation

• Syntax highlighting: Added ~> to the operator pattern in sudolang.tmLanguage.json for proper syntax highlighting
• Documentation: Added a new section in sudolang.sudo.md explaining the context operator with the example from the issue
• Test coverage: Added usage examples in syntax-test.sudo to demonstrate the operator in action

The operator is positioned in the regex pattern right before the pipe operator |> for consistency with existing operator patterns.

Fixes #[issue_number]

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add ~> operator</issue_title>
<issue_description>The ~> operator means "use the LH context to transform the input on the right." e.g.:

PainPoint {
  name
  description
  impact: 1..10      // how much this hurts when it happens
  frequency: 1..10   // how often this happens
}

UserStory {
  name
  description
  painPoint
  // The following is equivalent to:
  // priority = painPoint.impact * painPoint.frequency
  priority = painPoint ~> impact * frequency
  functionalRequirements
  mockups
  phases
}

Similar to with statements or binding contexts from functional programming languages.</issue_description>

<agent_instructions>Please look carefully at the documentation and syntax-test.sudo to figure out the best way to approach this.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes #35

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