Adds course/11-conditions: lesson, scenarios, nine test_11 tests in both
tracks, the cumulative reference (Module 10's plus conditions) and the NEAR
drop. The engine learns a condition role, rules carry conditions, and
Level.hasProperty and conversion evaluate content's condition checks against
the board whenever a rule is used. Resolution pairs only rules with the same
conditions. Catalog, harness contract, research notes and the diff-tracks
generator follow.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
