bump-leg.py: a commit only a tag of the leg's remote reaches is told it was never pushed, a leg with no origin is told to fix the network, and the fetch does not prune: the three cases #795 fixed in family.py #898

Goal: bump-leg's reachability words and its fetch match family.py's since #795 (6f64eea).

Filed by lane openRepoShape-3, from its triage of #458 at the v1.1.1 release commit 5017830: #458's line on bump-leg's three twins of #686. bump-leg.py's lines are unchanged since that line of 2026-10-17.

State at 5017830.

• fetch_leg runs git fetch -q origin +refs/heads/*:refs/remotes/origin/* (scripts/bump-leg.py:998, :1013-1014), with no --prune.
• A failed fetch prints a note. The refusal then adds "fix the network or the credential" (:1027-1030) without asking git remote get-url origin.
• bump-leg-commit-local-only (:1031-1039) says "somebody committed inside the leg's mount and never pushed it", without asking git ls-remote --tags --refs origin.

What happens. Measured on family.py's twins in #795:

• p03: a commit a remote tag holds is refused with a false reason.
• p10: git remote rename origin upstream is answered with network advice.
• No prune: a branch deleted on the remote still counts in on_a_remote_branch (:947).
• Refmap: git's opportunistic update can force-move a local branch through a configured +refs/heads/*:refs/heads/* refspec, so decide --refmap= for both tools.

Evidence. The lines above, read and not run.

Direction.

• Port family.py's words and fetch: --prune --no-prune-tags, keep the mount's own refs/remotes/origin/ refs, and skip negative refspecs.
• Add tests on the model of tests/test_family_bump_reachability_words.py.

Size: M.

Lane: openreposhape-3 (openRepoShape-3)