[paleolimbot]

Follow up #949 by requiring CMake 3.18 for find_library(REQUIRED), guarding CMP0135 by availability, and discovering unsuffixed Debug flatcc runtimes before falling back to Release. Update the library-directory description for shared runtimes.

Add build-time IPC smoke tests covering external static/shared runtimes, static preference, Debug/Release, both directory options, and missing libraries, with cross-platform CI. Package exports remain scoped to #963.

Validated on Linux with CMake 3.18.4 and 4.2.3; confirmed the CMake 3.23 policy failure before and successful configuration after. Formatting checks pass. Windows/macOS validation is delegated to CI.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.52%. Comparing base (55df060) to head (dc5f1b9).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #992      +/-   ##
==========================================
- Coverage   78.59%   78.52%   -0.08%     
==========================================
  Files         106      106              
  Lines       17153    17195      +42     
  Branches     2043     2064      +21     
==========================================
+ Hits        13482    13502      +20     
- Misses       2422     2431       +9     
- Partials     1249     1262      +13     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.