Document local git credential source

TODO.md

@@ -5,6 +5,7 @@
 - Future plans written in this file should be written in Korean by default.
 - When a meaningful coding/documentation task is completed, the workflow should aim to finish with a push to the git remote when the remote is available.
 - Every task handled in this repository should add or update a corresponding work note in `TODO.md` before the task is considered complete.
+- Git push authentication for this repo currently relies on the local credential file at `.local/git-credentials.psd1`; if push auth fails, retry using that file before treating the change as local-only.
 - Every meaningful change should record:
   - what changed
   - why it changed
@@ -267,6 +268,16 @@
   - backend debug broadcasts
 
 ## Recent Change Log
+- Date: `2026-03-24`
+- What changed:
+  - Added a working-rule note that git push authentication for this repository should be retried with the local credential file `.local/git-credentials.psd1` before leaving work in a local-only state.
+- Why it changed:
+  - The repository already stores the active git credential source locally, so the handover rules should point to it explicitly when push authentication fails.
+- How it was verified:
+  - local file presence check for `.local/git-credentials.psd1`
+- What is still risky or incomplete:
+  - The credential file is a local-machine dependency, so future environment changes still need to keep the file available and valid.
+
 - Date: `2026-03-24`
 - What changed:
   - Added an operating rule that every completed task in this repository should also be reflected in `TODO.md`.