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fix(pm): check-governed-merges refuses a flag its mode does not read, and a bare --pr beside a PM_SWEEP_REPO naming another repository #42106

Job	Run time
filter	18s
Test Core (5/6)	1m 12s
Test Core (1/6)	10m 33s
Test Core (4/6)	1m 10s
Test Core (2/6)	2m 22s
Test Core (6/6)	1m 12s
Test Core (3/6)	1m 24s
Dogfood Regression Gate	7s
Console Pin Gate	-1s
Build Docs	-1s
Temporal Conformance (live PG + MySQL)	-1s
Dogfood Verify CLI	-1s
Build Core	-1s
Dogfood Regression Gate (${{ matrix.shard }}/3)	-1s
Test Core	21s
	18m 33s