The fixture's expect_absent: "GigaBIT" was catching legitimate
semantic overlap, not retrieval bleed. The p06 ARCHITECTURE.md
Overview describes the Polisher Suite as built for the GigaBIT M1
mirror — it is what the polisher is for, so the word appears
correctly in p06 content. All retrieved sources for this prompt
were genuinely p06/shared paths; zero actual p04 chunks leaked.
Narrowed the assertion to expect_absent: "[Source: p04-gigabit/",
which tests the real invariant (no p04 source chunks retrieved
into p06 context) without the false positive.
No retrieval/ranking code change. Fixture-only fix.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Anto01
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