* fix(#2019): planning-config.md global-learnings path ~/.gsd/learnings → ~/.gsd/knowledge
The features.global_learnings row pointed at ~/.gsd/learnings/ but the
implementation (src/learnings.cts, execute-phase.md) uses ~/.gsd/knowledge/.
Docs now match the code.
Closes#2019
* docs(#2019): backfill changeset pr 2026
