feat: cognitive service dispatch engine

[4444J99]

Work type taxonomy (8 types), task classifier, fleet router with cognitive-class hard filters, service restrictions, agent guardrails. PR #10. DONE-285.

[github-actions]

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[4444J99]

Engagement disposition: evolving. The core engine is substantially present on main: conductor/work_types.yaml defines the work-type taxonomy, conductor/task_dispatcher.py classifies work and reports exclusion reasons, and conductor/fleet_router.py hard-filters by cognitive class, never_decide, phase affinity, and sensitivity. It is not currently verified complete because live PR CI fails tests/test_fleet.py and tests/test_task_dispatcher.py around the default FleetRegistry loading zero active agents, so the fleet registry baseline still needs repair before this can be treated as shipped infrastructure.