FIX: carapace python CI failures after 0-5 Clawmark rescale

[ryan10sa-star]

Diagnosis

The python CI job (pip install -e ".[dev]" && pytest in python/) has been failing on main since the v0.5.0 release. The audit work in #13 (CHANGELOG + publish workflow only) does not touch the python pipeline; the failure pre-existed.

Root cause is a stale version assertion in python/tests/test_v04_features.py::test_v04_public_entrypoint_exports:

assert carapace.__version__ == "0.4.0"

This test was added with the v0.4 trust stack (2026-05-16). The package was later bumped to 0.5.0 in python/carapace/__init__.py (commit 5c9c1ec, 2026-05-20) as part of Phase B catalog/receipts work, but the v0.4 export test was never updated. It has been failing every CI run since.

Not related to the 0-5 Clawmark rescale (#12) — that landed correctly with the matching test/fixture updates in python/tests/test_v05_phase_b.py. The catalog tests are clean; all clawmark_score literals and score_threshold references in python/tests/ are already on the 0-5 scale.

Fix

Replaced the brittle exact-version assertion with a stable check that

1. Verifies a version string is exported, and
2. Asserts it is >= "0.4.0" (lexicographic, fine for the foreseeable 0.x line).

The exact-version contract is already covered by test_v05_phase_b.py::TestSDKExports::test_version_is_v050, which asserts __version__ == "0.5.0". The v0.4 test's purpose is to confirm the v0.4 trust-stack APIs (EpistemicLog, ComplianceProfile, EscalationPolicy, etc.) are still re-exported from the top-level package — that contract is preserved.

Scope

• Only python/tests/test_v04_features.py is touched (one test, one assertion).
• No protocol source, no fixtures, no workflows, no CHANGELOG.md, no pyproject.toml.

Test plan

• CI python job goes green on this branch
• test_v04_public_entrypoint_exports still passes when the package eventually bumps to 0.6.0 (lexicographic >= "0.4.0" holds)
• All other v0.4 export assertions (EpistemicLog, ComplianceProfile, evaluate_compliance, EscalationPolicy, check_escalation, BUILTIN_PROFILES) still verified

https://claude.ai/code/session_01UEu5f1gCA5nGnZrf67RK1c

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