check-test-enumeration.sh signed four suites as 'likely CI-fit; #1017 burndown'.
Measured all four: each passes standing alone, and each still passes with tmux
removed from PATH entirely (test-start-agent-session.sh writes its own tmux shim
into a fake bin dir, so it never needed the real binary).
Red-first: removing the four exclusion lines makes the guard report exactly four
UNENUMERATED failures. Appending the four to test:framework-shell returns it to
OK, with in-population enumerated going 32 -> 36 and signed exclusions 19 -> 15.
Refs #1017