precedent-maintainlisted

# Check the graph for problems ```bash uv run <cli> maintain ``` `<cli>` is this package's `precedent.py`; the `precedent` skill says how to locate it. Report what it finds. Contradictions (one project, one topic, two live answers) are for the user to resolve — record a new decision with `--supersedes <id>` rather than editing history. Suspected duplicate tags are repaired with `tag --merge <old> --into <new>`. Projects with no portable identity are reported too. A `split across two nodes` line means one repo has two Project nodes holding two separate decision histories — surface it, run the `cypher` command it prints to show both sides, and let the user decide. Never merge them yourself: precedent has no merge command precisely because merging two histories is a judgment. Run `maintain --apply` only to delete orphan nodes; everything else is a proposal that needs the user's judgment.