[PWGLF] Add new process to identify trigger/daughter tracking in hStrangeCorrelation.cxx

[kcui1]

This PR adds an independent MC truth-matched h–K⁰S pair-loss diagnostic process to identify trigger/daughter tracking, V0 reconstruction, selection, and autocorrelation losses in closure tests, with dedicated fully labeled QA histograms.

[github-actions]

O2 linter results: ❌ 12 errors, ⚠️ 2 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/o2 for 46b7e00 at 2026-08-03 16:05:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGLF/Tasks/Strangeness/hStrangeCorrelation.cxx:3891:34: error: missing initializer for member 'HStrangeCorrelation::PairLossTruthK0Info::positiveDaughter' [-Werror=missing-field-initializers]
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGLF/Tasks/Strangeness/hStrangeCorrelation.cxx:3891:34: error: missing initializer for member 'HStrangeCorrelation::PairLossTruthK0Info::negativeDaughter' [-Werror=missing-field-initializers]
ninja: build stopped: subcommand failed.

Full log here.

[alibuild]

Error while checking build/O2Physics/staging for 46b7e00 at 2026-08-03 16:10:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGLF/Tasks/Strangeness/hStrangeCorrelation.cxx:3891:34: error: missing initializer for member 'HStrangeCorrelation::PairLossTruthK0Info::positiveDaughter' [-Werror=missing-field-initializers]
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGLF/Tasks/Strangeness/hStrangeCorrelation.cxx:3891:34: error: missing initializer for member 'HStrangeCorrelation::PairLossTruthK0Info::negativeDaughter' [-Werror=missing-field-initializers]
ninja: build stopped: subcommand failed.

Full log here.