docs: note jj fallback in repo inference review convention

[detail-app]

REVIEW.md told reviewers that new commands accepting a repo positional should fall back to inferring owner/repo from the git remote. After jj support was added to src/utils/vcs.rs, this convention is stale — a contributor following it would omit the jj fallback and write code inconsistent with the new pattern (and with the "git or jj remote (origin)" help text now advertised by detail bugs/detail rules/detail scans). Updated to mention jj and point at src/utils/vcs.rs for the canonical implementation.

Introduced by commit 9b815d7 (@dbt, #324)

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Summary by cubic

Update REVIEW.md to state that repo inference should fall back to the git or jj remote and point to src/utils/vcs.rs for the canonical logic. Aligns review guidance with CLI help for detail bugs, detail rules, and detail scans.

^{Written for commit 6e5fac9. Summary will update on new commits.}

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