RAII-based profiling session management

[codingwithmagga]

Description

A profiling session class that encapsulates start, stop, and read operations via RAII, ensuring resource-safe profiling even in the presence of exceptions.

Acceptance Criteria

• Counters are started on construction and stopped automatically on destruction
• An explicit read() call returns the current counter values at any point
• File descriptors and other resources are released correctly on exception
• Multiple independent sessions can exist concurrently

Notes

TDD — tests are written before implementation code.