mtest 0.9.0

• A selection excludes, and selects where declared (SPEC-017 P4.3). In MTEST_SELECT, a line
  !<id> leaves out that case and the cases it declares, and a line ?<id> selects a case where
  it is declared and is not missing where it is not; a selection of exclusions alone runs every
  case but those. The program event states "selection": ["except", "optional"], so a runner
  uses them only with a program that understands them. A runner divides a long case among
  processes by the cases it declares, which a list does not name (P3.4) and its history does: each
  process but one selects (?) the measured cases it was given, so a case since removed fails
  nothing, and the last selects the case without them (!), so a case no run measured runs once.
  Measured on mcpp's CI: two suites of 1373 s and 1375 s ran their cases one after another, and
  the longest case of either takes 564 s.
• CI builds and tests with mcpp 2026.11.14.1. 2026.11.10.1 took an emsdk from a package store
  restored without the loader its compiler names as present (provides no std module source);
  2026.11.13.1 and later restore that loader's link.