fix(coverage): normalize report and diff paths before intersecting

simplecov reports absolute source paths while git diff emits repo-relative ones, so cj/--coverage-intersect joined them by exact key and matched nothing — every changed file read ":tracked nil" under the working-tree, staged, and branch scopes (whole-project worked only because both sides came from the same simplecov source). A new cj/--coverage-relativize-keys normalizes both tables to repo-relative in cj/--coverage-read-and-display before the intersect; the intersect stays pure. Covered by 5 unit tests plus an integration test that drives the real parsers with an absolute-key report and a relative-key diff.

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