test(runs): pin previous-release run.json reader to v0.25.0 fixture

[solomonneas]

Summary

• Replace the closure-based previous-v1-reader compatibility check with a versioned fixture derived from tag v0.25.0 (last release before journal authority feat(runs): add lifecycle journal kernel #607).
• Pin the accepted nonterminal status set, required fields, and ignore-unknown-keys parse behavior in tests/fixtures/run-compat/v1-reader-contract.json.
• Expand test_default_authority_run_json_remains_readable_by_previous_v1_reader to validate authoritative, paused (status: running plus approval_reference and journal cursor fields), and legacy snapshots against that fixture.

Acceptance criteria → tests

Acceptance	Test
Fixture names its source tag and is not editable without a visible diff	tests/fixtures/run-compat/v1-reader-contract.json (derived_from.tag / comment)
Tests cover authoritative, legacy, and paused snapshots against the fixture	tests/test_aboyeur.py::test_default_authority_run_json_remains_readable_by_previous_v1_reader
Old closure-based test is removed or delegates to the fixture	Same test; _previous_v1_reader loads the fixture contract

Verification

• brigade work verify run --target . --command "./scripts/verify" --capture brigade-work
• Receipt: 20260801-032148-work-verify-fb1411

Notes

• Tests and one fixture file only; no src/ changes.
• External grader review before merge; do not merge from this PR.

Closes #637.

Made with Cursor

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