git keeps an annotated tag's signature inside the message body, so
`git tag -l --format=%(contents)` returns the JSON record followed by an
armored block, and `json.loads` of the whole message raises "Extra data: line 2
column 1" at the armor's first byte. Claim tags, final receipts and build
receipts are created on a host whose git signs tags, so stable admission
(`python -m scripts.releases.stable admit`), ordered reconciliation
(`python -m scripts.releases.sequencer`) and tagless build receipts each
refused to read their own tag.
Add `versioning.tag_record()` as the one reader of a tag's record — the text
before the armor, unchanged for an unsigned tag or a detached signature — and
route every `%(contents)` read through it in stable.py, sequencer.py and
commit_build.py. commit_build imports it inside the function so its module
surface stays stdlib-only for the isolated checkout-admission step.
The reads inside the release tests use the same reader, and the one fixture
that creates a plain final tag says so explicitly, so the release suite passes
on a host whose git signs tags by default.
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