shape-doctor.py: in a root that lost scripts/repo_shape.py, the agent-files row's WHY still says to run the root's own validate-pins.py "to confirm the digest", a line that exits 1 with ModuleNotFoundError #776

Goal: in a root that has lost scripts/repo_shape.py, no row tells the reader to run a command that cannot run. The doctor gives the agent-files row's WHY the same treatment that #737 gives the own-copy validator rows and #750 (#771) gives the lockstep NEXT.

Filed by lane openRepoShape-3 under v1.1.1, on Brett Heap's word of 2026-10-16T13:35:28Z ("yes create v1.1.1"). It is the one item left from lane 3's reviewer RV-a's sweep of #771 (S1, #771 (comment)). The PR's writer had flagged it as not settled. Main does the same, so it is not a regression.

What happens (measured on main e3137010 and on #771's head c90a137c):

• The root: it has lost scripts/repo_shape.py, and its pinned AGENTS-shape.md is deleted.
• What the row says: the agent-files row's WHY (shape-doctor.py:7631-7638 at c90a137c) tells the reader to run python3 <root>/scripts/validate-pins.py --root <root> "to confirm the digest".
• What that line does: pasted, it exits 1 with ModuleNotFoundError: No module named 'repo_shape'.
• The row's own NEXT (git -C <root> checkout -- AGENTS-shape.md) runs fine.
• Why it is not a shape-doctor.py: in a root that lost scripts/repo_shape.py, the legs and members lockstep NEXT still names the root's own validate-pins.py line, which exits 1 with ModuleNotFoundError, while the pins row beside it prints the checkout HEAD cure #750 failure: it is a WHY, not a NEXT, so shape-doctor.py: in a root that lost scripts/repo_shape.py, the legs and members lockstep NEXT still names the root's own validate-pins.py line, which exits 1 with ModuleNotFoundError, while the pins row beside it prints the checkout HEAD cure #750's goal ("every NEXT … runs") holds.
• Another root, by code reading only: the same WHY also names that file where the root has no own validate-pins.py at all. This one is not measured.

Fix: where the root's own copy cannot import repo_shape (imports_repo_shape), do one of these:

• say to restore scripts/repo_shape.py first, with shape-doctor.py: an own-copy validator row whose crash is a root's lost scripts/repo_shape.py names git -C <root> checkout HEAD -- scripts/repo_shape.py as its NEXT (none where HEAD no longer holds it) and the validator in its WHY (#697) #737's lost_repo_shape_cure words or a pointer to the pins row's NEXT;
• drop the confirm clause.

Where the root has no own validate-pins.py, name the standard's copy, as the validator rows do (validator_for).

Tests: in tests/test_doctor_validator_rows.py (#737's file, beside #771's #750 section).

• The root above: the agent-files WHY names no validate-pins.py line that dies. Assert this by pasting what it names, or by asserting the cure's words.
• A root with repo_shape.py intact: the WHY is unchanged, byte for byte.

Lands after #771 (#750), which it builds on.