Add debug step through mode schema support

[Copilot]

Implements debugging schema properties to enable step-through debugging functionality in Doc Detective.

Changes Made

Config v3 Schema

Added a new debug property that accepts:

• false (default): disables all debugging
• true: allows pausing on breakpoints, waiting for user input before continuing
• "stepThrough": pauses at every step, waiting for user input before continuing

{
  "debug": true
}

{
  "debug": "stepThrough"
}

Step v3 Schema

Added a new breakpoint boolean property to indicate which steps should act as breakpoints when debugging is enabled:

• true: execution will pause at this step when debug mode is enabled
• false (default): step will not act as a breakpoint

{
  "stepId": "important-step",
  "goTo": "https://example.com",
  "breakpoint": true
}

Implementation Details

• Both properties have appropriate defaults (false) to maintain backward compatibility
• The breakpoint property is available on all step types since it's defined in the common schema section
• Added comprehensive examples demonstrating usage of both properties
• All existing tests continue to pass (263 total tests)
• New properties correctly validate valid values and reject invalid ones
• Schema dereferencing and building works correctly for the new properties

Validation

The implementation includes validation that:

• debug accepts only boolean or the string "stepThrough"
• breakpoint accepts only boolean values
• Invalid values are properly rejected with descriptive error messages

Fixes #125.

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[promptless]

📝 Documentation updates detected!

New suggestion: Update debug schema documentation to match actual implementation