The lone TEST node whose concept attribute was set as the string "true"
instead of boolean true (all 18 other concept-marked TEST nodes use a
real boolean) — R-19's presence check reads attributes.concept === true
strictly, so this node silently failed testRef-coverage conformance
(mcp.tests-deduction.test.ts), blocking the v0.10.1 publish workflow's
test gate. Fixed through the Apply-Gate (update-node), not a hand-edit
of the committed SSOT, then re-exported.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>