M4: the halt regex matched any **halt** in a 2500-char window, so the PM's
mutant (first **halt** → "continue anyway") survived. Two new tests pin the
sentence right after the gate command and the could-not-run halt. Mutant
run: old test ok, both new tests not ok.
M5: nothing guarded 2045432's allowlist line. New test: trekbrief keeps
intent_approved, drops task/project_dir. Mutant (line removed): not ok.
M3 (red): the header claims a reflow keeps the approval; joining lines is
STALE. Pins the honest wording + the STALE behaviour.
M7 (red): the trekreview exemption is not documented as a bypass of the
same trust class as self-stamping (header, HANDOVER-CONTRACTS, trekplan).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Kjell Tore Guttormsen
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