Operational task types (debug, review, refactor, test, explain) now gate
before orchestration in the keyword cascade. Previously, prompts like
"review the orchestration layer" or "refactor the pipeline dispatch"
matched "orchestrat"/"dispatch" and misclassified as TaskOrchestration.
Planning is also moved below the operational types.
Expanded orchestration keywords to cover common intent that the original
four keywords missed: "fan out", "subtask", "delegate to", "spawn elf".
Adds regression tests for false-positive cases and positive tests for new
keywords.