fix: resolve memory leaks, race conditions, and listener cleanup issues in parallel task execution

[nikomatt69]

Memory Leak Fixes:

• streaming-orchestrator: Remove absorbed messages beyond limit to prevent messageQueue growth
• streaming-orchestrator: Add performPostTaskCleanup() to clean state after parallel task completion
• agent-service: Add cleanupCompletedTasks() to remove old completed tasks from activeTasks map
• plan-executor: Add cleanupExecutionHistory() and clearExecutionHistory() methods
• parallel-task-context-manager: Add automatic cleanup of completed chains after 60 seconds
• parallel-task-context-manager: Add dispose() method for full resource cleanup

Listener Cleanup Fixes:

• plan-executor: Refactor executeAgentStep() to use proper listener tracking and guaranteed cleanup in finally block
• plan-executor: Clear timeout handles and all registered listeners even on errors or timeouts

Race Condition Fixes:

• plan-executor: Use local variable tracking for listeners to prevent race between timeout and completion
• streaming-orchestrator: Ensure input queue bypass is disabled after task completion

Additional Improvements:

• Add bounds on Map sizes to prevent unbounded growth
• Clear panels content on task completion to free memory
• Clean adaptive metrics entries to prevent accumulation

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Status	Name	Latest Commit	Updated (UTC)
❌ Deployment failed View logs	nikcli	f664186	Jan 06 2026, 05:36 AM