* ci: promote dev to prod via fast-forward instead of force-pushing main
Repoints the daily promotion workflow to feed prod from the dev integration
trunk (prod <- dev) rather than force-pushing the upstream mirror (main).
Uses a fast-forward push so a release can never rewrite prod history.
* fix: sort imports in aegra_entry.py to unblock dev CI
The Sea Haven deployment commit left aegra_entry.py with an unsorted import
block (ruff I001), which fails the required 'Agent lint' check and blocks all
merges into dev. Apply the import-sort autofix.
Adds a scheduled workflow that force-pushes main onto a prod branch at
08:00 UTC (midnight PST / 1am PDT). The LangGraph deployment will track
prod instead of main, so routine merges no longer trigger redeploys
that cancel in-flight 30-minute coding runs. workflow_dispatch is
retained for hotfixes that need to ship immediately.
