Fix compilation errors

Fix the compilation errors in the feature branch so I can open a PR before lunch. Compile the branch, resolve all missing headers and type errors, ensure it builds with the project's warning level as errors, and run a quick smoke test of the affected feature.

Before I push the corrected branch to the team, make the diff easy to review: consolidate trivial fixes (namespace or include order) into one commit, explain any API changes in the commit message, and flag any places where I had to weaken a const or change a template instantiation so reviewers know the risky spots.

I refactored a class template and now compilation throws a cascade of template instantiation errors in unrelated files. I need to open a PR but I can't tell if my change exposed real API breakage or a misuse elsewhere. The reviewer is strict about ABI stability. What's the likely diagnosis and the minimal corrective step that preserves behavior while keeping the CI green?

Whenever I do cross-module refactors, CI blows up with type and template errors and I spend days fixing fallout. It slows feature delivery and makes the team reluctant to improve code. Which habitual change in how I refactor or prepare branches would prevent these widespread compilation regressions?