refactor: add exact current-format writers - #8022
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This was referenced Jul 27, 2026
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Part 5/12 of #7877. Depends on #8021.
This is an independently reviewable step toward the final layout demonstrated in #7979.
This PR adds writer implementations owned by
versions::v2_0,versions::v2_1,versions::v2_2, andversions::v2_3. Each exact version composes the mechanisms it supports; genuinely shared structural machinery remains under the version-neutral writer module.Some composition code is intentionally repeated across adjacent versions. That repetition is the isolation boundary: changing a newer version must not silently change an older version. Public writer dispatch is left unchanged in this step and is activated by the next PR.
Validation:
cargo clippy --all --tests --benches -- -D warningscargo fmt --all -- --check