chore: initialize project docs

.project-docs/80-commitments/commitments.md

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+# Commitments
+
+Track future-facing memory: promised follow-ups, unfinished loops, timed checks, and restart points.
+
+| Date | Commitment | Trigger / Due | Owner | Status | Next Action |
+|---|---|---|---|---|---|
+
+## Use
+
+Record only commitments that should affect future sessions. Routine next steps can stay in `30-worklog/current-state.md`.