feat(tui): pre-register specialists on PARALLEL_STARTED event

[JeremyDev87]

Summary

Closes #475

• Pre-register specialist agents as idle nodes in the dashboard agents Map when PARALLEL_STARTED event is received, so they appear in FlowMap early before individual AGENT_ACTIVATED events arrive
• Guard against overwriting already-active agents (idempotency via agents.has(id) check)
• Align integration test agentIds to use specialist:${name} convention, consistent with response-event-extractor.ts and ensuring proper idle→running state transitions

Changes

File	Change
use-dashboard-state.ts	Replace PARALLEL_STARTED no-op with pre-registration logic (+15 lines)
use-dashboard-state.spec.ts	Replace no-op test with 3 tests: pre-register, idempotency, empty array edge case
eventbus-ui.integration.spec.tsx	Align specialist agentIds to specialist:${name} format

Design Decisions

• ID format: specialist:${name} to avoid collision with general agent IDs and stay consistent with AGENT_RELATIONSHIP events
• Idempotency: Skip pre-registration if agent already exists (preserves running/done status)
• Stage source: Uses event payload mode for stage field (not state.currentMode)

Test Plan

• Unit: pre-register specialists as idle agents on PARALLEL_STARTED
• Unit: do not overwrite already running specialist
• Unit: handle empty specialists array as no-op
• Integration: FlowMap renders specialists after PARALLEL_STARTED + AGENT_ACTIVATED
• Integration: globalState transitions (RUNNING → IDLE) with specialist lifecycle
• Full suite: 159 files, 3689 tests passed

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Project	Deployment	Actions	Updated (UTC)
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