fix(audit): a README that disclaims a capability is not claiming it

[cyberlife-coder]

Found by the guard-contract job added in #1595 turning red — the gate catching a defect in its own checker.

The feature audit matched capability keywords anywhere in the prose, so this honest sentence:

No GPU in the published wheels. The gpu Cargo feature exists but is not enabled by [tool.maturin]; it requires building from source.

registered gpu as a documented capability. The audit then looked for it in the Python API, did not find it, and reported the crate as MISSING a feature whose absence its README had just spelled out.

That penalises exactly the disclosure this audit exists to encourage: the more honest a README is about what it does not ship, the more gaps it invents.

Fix

Scoped to a window before the keyword rather than the whole line — the same shape as check-promise-contract.py’s _is_negated, which already drew this distinction.

A line-wide test is too blunt in the other direction:

GPU acceleration is enabled by default and needs no extra build step.

is a real claim, and the trailing no must not erase it. The first attempt at this fix did exactly that, which is why both cases are pinned by a test rather than one.

Verification

• test_disclaimed_capability_is_not_a_claim — red before, green after
• test_a_real_claim_is_still_detected — the guard must not become a way to hide an unbacked claim
• 37 guard-contract tests green; check-feature-claims.py still exits 0 on develop

Worth flagging separately

With the false positive removed, the documentation branch (#1593) still reports three genuine gaps it introduced — column_store and streaming present in the API but undocumented, streaming claimed but absent elsewhere. develop is clean. Those belong to that PR, not this one.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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