CompilerStack full reset retains experimental and debug info settings

Description

CompilerStack::reset(false) is documented and implemented as a full reset of compiler settings. However, it does not restore m_experimental or m_debugInfoSelection to their defaults. Reusing a stack after enabling experimental mode or selecting non-default debug info can therefore change the behavior or output of the next compilation despite requesting a full reset.

reset(true) should continue retaining both settings, while reset(false) should restore experimental mode to false and debug info selection to DebugInfoSelection::Default().

Environment

• Compiler version: current develop (c9e112d18)
• Compilation pipeline: all (observable with analysis for experimental mode and IR output for debug info)
• Target EVM version: default
• Framework/IDE: direct CompilerStack API
• EVM execution environment / backend / blockchain client: not applicable
• Operating system: Linux

Steps to Reproduce

1. Construct a CompilerStack.
2. Call setExperimental(true) or selectDebugInfo(DebugInfoSelection::None()).
3. Call reset(false).
4. Compile a new source.

The new compilation still uses the previous experimental/debug-info setting instead of the documented defaults.