docs(commits): add Step 0 pre-flight reconcile and pre-push check

The publish flow had no fetch step before commit, PR creation, or push. Long sessions or multi-machine work could land local commits on a stale base, producing non-fast-forward push failures that you have to unwind under publish-step pressure.

Step 0 fetches all remotes and checks the current branch against its upstream before Step 1's code review. If the branch is behind, the rule branches on tree state and divergence shape: clean fast-forward, surface dirty-tree behind, or surface a true divergence and ask before rebasing or merging. The Step 0 wording covers the new-branch case (no upstream → skip the divergence check, the first push sets it).

The Pre-push reconcile bullet in Merge Strategy handles the smaller window between Step 0 and the actual push. Reviewing and drafting can take several minutes; another machine or teammate can push during that window. One more fetch immediately before push is cheaper than recovering after a failed push.

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