[AISOS-2119] Josh-test - ignore

[JoshSalomon]

Summary

This PR adds lifecycle logging to the implement_task function, enabling observability into when implementation steps start and complete. These INFO-level logs capture task metadata (task name, feature ID, task ID) with ISO 8601 UTC timestamps, providing valuable telemetry for monitoring pipeline execution and debugging failures.

Changes

Core Implementation

• src/forge/workflow/nodes/implementation.py:
  • Added from datetime import UTC, datetime import for timestamp generation
  • Added start lifecycle log emitted after task metadata is fetched from Jira
  • Added end lifecycle log using try/finally pattern to ensure emission on both success and failure
  • Initialized task_name to "unknown" before Jira fetch as a failsafe fallback
  • Moved task_name and started flag initialization before the outer try block
  • Removed nested inner try/finally block
  • Moved end lifecycle log to outer finally block alongside jira.close() to capture all exceptions
  • Added conditional to only emit end log if start log was emitted

Unit Tests

• tests/unit/workflow/nodes/test_implementation.py:
  • Added import logging for log level assertions
  • Created TestImplementationStepLogging test class with comprehensive test coverage:
    • test_start_log_emitted_with_all_fields - verifies all required fields in start log
    • test_start_log_level_is_info - verifies INFO log level
    • test_start_log_contains_iso8601_timestamp - validates timestamp format with regex
    • test_end_log_emitted_on_success - verifies end log on successful completion
    • test_end_log_emitted_on_container_failure - verifies end log when container fails
    • test_end_log_emitted_on_exception - verifies end log when exceptions are raised
    • test_log_uses_unknown_when_task_name_unavailable - verifies fallback behavior

Implementation Notes

• Log Format: Both start and end logs follow the spec format: Implementation step {started|completed} - task: {task_name}, feature_id: {ticket_key}, task_id: {current_task_key}, timestamp: {iso8601_timestamp}
• Exception Safety: The end lifecycle log is placed in the outer finally block (alongside jira.close()) to ensure it's emitted for ALL exceptions, not just those from the container runner. A started flag prevents emission if the start log was never reached. The task_name and started flag are initialized before the outer try block, and the nested inner try/finally block was removed.
• Fallback Handling: task_name defaults to "unknown" before Jira fetch, ensuring logs are valid even if task metadata retrieval fails.
• Timestamp Pattern: Uses datetime.now(UTC).isoformat() consistent with other workflow nodes (prd_generation.py, qa_handler.py, spec_generation.py).

Testing

• All new unit tests pass via pytest tests/unit/workflow/nodes/test_implementation.py
• Tests use caplog fixture with caplog.at_level(logging.INFO) context manager
• Tests verify log message content via caplog.text and log level via caplog.records
• Python syntax validation passed (python -m py_compile)
• Ruff linting passed with no issues

Related Tickets

• AISOS-2119 - Parent feature ticket
• AISOS-2126 - Add start lifecycle log
• AISOS-2127 - Add end lifecycle log with try/finally
• AISOS-2128 - Unit tests for start log
• AISOS-2129 - Unit tests for end log on success
• AISOS-2130 - Unit tests for end log on exception
• AISOS-2131 - Unit test for missing task name fallback

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