[MendixMau]

What

With Row groups: on, a script that names no build-plan BUILD row used to exit 3, "not checked", which nobody saw. Now row-groups.sh check exits 4 with a hint: start the script with -- rows: N (or -- rows: N,M,… for a group). exec.sh prints that hint as a ⚠ warning and notes rows: no -- rows: header (not grouped) in the BUILD-LOG row. It never refuses.

Why

In the #581 A/B (purchase-requests app, Sonnet, 2026-10-27), the build with Row groups: on wrote 31 scripts numbered on their own sequence (052-…, 076-…), none with a -- rows: header. All 31 read "not checked", so row grouping never ran once. The speed gain in that run came from the lint diff and hot reload, not from grouping. Projects that switch grouping on should be told when it isn't taking effect.

Impact on existing projects

• Row groups off (the default): nothing changes. Exit 3 stays exit 3, and no new output.
• Row groups on: one warning line per un-headed script, plus a note in the BUILD-LOG row. No refusals, and exit codes of exec.sh are unchanged.
• Always-loaded skill text: +0 words. The reminder sits in the instrument output, at the moment it's needed.

Tests

tests/wave2/test-row-groups.sh G4 (new):

• opted in, a script numbered past the plan → exit 4 with the hint;
• opted in, an unnumbered script → exit 4;
• not opted in, the same script → still exit 3.

The first two fail on the previous row-groups.sh. Full fixture: 20/20. check-scripts and check-pr-discipline are clean.

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