Fix TDD example in contributing guidelines to match Bolt Task API

[Copilot]

Summary

The TDD example in CONTRIBUTING.md referenced non-existent API patterns. Updated to reflect the actual Bolt Task implementation:

• Task invocation: task(config) → task(config=config)
• Implementation methods: execute() → _configure() and _execute()
• Configuration access: Direct access → _require() helper
• Test assertion: Removed non-existent Result return value, test configuration directly

# Before: Non-existent patterns
result = task(config)
assert result.success is True

class MyNewTask(Task):
    def execute(self):
        return Result(success=True)

# After: Actual Bolt API
task(config=config)
self.assertEqual(task.param, "value")

class MyNewTask(Task):
    def _configure(self):
        self.param = self._require("param")
    
    def _execute(self):
        pass

References

• Addresses feedback on docs: add comprehensive contributing guidelines with TDD requirements #129: docs: add comprehensive contributing guidelines with TDD requirements #129 (comment)
• Based on patterns in src/bolt/api.py and test/test_api.py

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[CurroRodriguez]

Closing because the changes no longer apply.