[cpp-RCP-12] CI clang-tidy gate is neutralized by "|| true" #80

Location: .github/workflows/ci.yml:154.

Finding: The clang-tidy step runs with --warnings-as-errors='*' but the whole command is suffixed with || true, so any finding clang-tidy reports is swallowed and the CI job passes regardless. As written, --warnings-as-errors='*' is decorative — it can never actually fail the job.

Recommendation: Remove the || true so genuine clang-tidy findings fail the job, or, if some specific checks are meant to stay advisory-only, scope that explicitly (e.g. via .clang-tidy check-level configuration) rather than blanket-swallowing the whole step's exit code.

Verification: Independently re-read .github/workflows/ci.yml against current HEAD (commit 4b9449a, 2026-07-29). Confirmed line 154 ends in || true immediately after the --warnings-as-errors='*' clang-tidy invocation.

Filed from the 2026-07-29 ecosystem audit register; independently re-verified against current HEAD before filing.