docs(progress): record response layer push failure

.learnings/ERRORS.md

@@ -2,6 +2,31 @@
 
 Command failures and integration errors.
 
+---
+## [ERR-20260920-041] gitea-cached-credential-rejected
+
+**Logged**: 2026-09-20
+**Priority**: medium
+**Status**: open
+**Area**: infra
+
+### Summary
+Gitea rejected the cached credential while pushing the verified response-layer commit.
+
+### Error
+`remote: Failed to authenticate user` and `fatal: Authentication failed`.
+
+### Context
+Local commit `89c20f3` was created successfully; no remote history changed. Earlier pushes to the same URL succeeded.
+
+### Suggested Fix
+Use the configured Git Credential Manager to refresh only the `git.jinome.org` credential, then push all pending commits and verify local/remote HEAD equality.
+
+### Metadata
+- Reproducible: not yet known
+- Related Files: `.git/config`, `Progression.md`
+- Pattern-Key: git.cached-credential-rejected
+
 ---
 ## [ERR-20260920-040] system-python-missing-project-package