…interpolation and strengthen tests

- Add maintenanceRequireScript() helper to maintenance_workflow.go
  The raw YAML strings had literal " + JsRequireGhAw(...) + " text embedded
  inside backtick string literals instead of being evaluated as Go code.
  Added helper function and used it in all 7 affected yaml.WriteString() blocks.
- Fix compiler_custom_actions_test.go: test #5 duplicated test #4.
  Updated to verify INPUT_DESTINATION is NOT set in script mode (regression
  guard for the destination: removal change).
- Fix mcp_scripts_generator_test.go: strengthen logDir assertion from
  just checking "mcp-scripts/logs" to checking full
  "process.env.GH_AW_HOME + '/mcp-scripts/logs'" expression.
- Recompile agentics-maintenance.yml - require() calls now correct.

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>