[AISOS-2119] Josh-test - ignore

[JoshSalomon]

Summary

This PR adds structured logging to the implement_task function to improve observability and enable better tracking of task implementation lifecycle events. The new logs capture implementation start, completion, and failure events with consistent structured fields (event type, task name, feature ID, task ID, and success status), supporting monitoring dashboards and debugging workflows.

Changes

Structured Logging in Implementation Node

• Added INFO-level log at implementation start with event="implementation_started" after Jira issue fetch
• Added INFO-level log on successful completion with event="implementation_completed" and success=True
• Added INFO-level log in exception handler with event="implementation_ended" and success=False
• Initialized task_summary to "unknown" before Jira fetch to handle early failure cases
• All logs include consistent extra fields: event, task_name, feature_id, task_id

Unit Tests

• Added TestImplementTaskStructuredLogging test class with comprehensive test coverage
• Tests verify log levels, structured fields, and edge cases (empty summaries, special characters, early failures)
• Tests follow existing patterns using caplog fixture and helper functions (_make_state, _make_mock_jira, etc.)

Implementation Notes

• The task_summary variable is initialized to "unknown" before the Jira fetch to ensure the failure log always has a valid value, even if the exception occurs before the summary is retrieved
• End logs use event="implementation_ended" for failures (vs "implementation_completed" for success) to distinguish the event types in log aggregation
• Logs are emitted before status comments/notifications to ensure accurate timing in observability tools
• Special characters in task summaries are logged as-is without escaping, preserving the original content

Testing

• Added 7 unit tests covering all specified scenarios in TestImplementTaskStructuredLogging
• Tests verify structured log fields using pytest's caplog fixture
• Tests cover success path, failure path, exception handling, placeholder handling, and edge cases
• All tests pass with uv run pytest tests/unit/workflow/nodes/test_implementation.py -v
• Code passes uv run ruff check src/forge/workflow/nodes/implementation.py

Related Tickets

• AISOS-2119
• AISOS-2201
• AISOS-2202
• AISOS-2203
• AISOS-2204

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