OrKa 0.9.4: cleaner logs, full GraphScout paths, ISO timestamps

TLDR: final agent is always logged, GraphScout multi hop paths execute completely, timestamps are ISO strings to avoid JSON errors.

What changed

• [ORKA-FINAL] is emitted on all return paths
• OrkaResponse.timestamp uses ISO 8601 string format
• Execution engine runs full GraphScout path arrays in order with context preserved
• Response builder completes the sequence and formats the final output

Example response

{
  "agent": "response_builder",
  "timestamp": "2025-10-03T12:34:56.789012",
  "ok": true
}

Docs and details:

• Git
• pypi
• web