audit: cycle 0021 (#44) — drift-noted; fan-in distinguishability shipped
Architect drift review over efbe0f4..3f4d756 (the two un-audited interim render commits 32ac8a3/b73d707 plus the 0021 fan-in cycle). Holds: - C23 intact — the IndistinguishableFanIn check is a construction-phase pre-pass; the compilat stays name-free (compiled_view_golden byte-stable). - C9 boundary clean — signature distinguishability lives at the blueprint layer and dissolves at inline; the C9 ledger refinement is accurate and in-format. - Pre-pass placement (before the arity gate, not inside inline_composite) is the spec-aligned home, not drift: a no-param compile() of a param-bearing composite would hit ParamArity first. Regression: commands.regression is empty (no gate) — architect is the sole gate; clean of contradictions. Debt (correctness-neutral, not blocking) tracked in #45 for a focused tidy iteration rather than rushed at cycle tail: - inline_composite's alias-validity loop is now dead for BadInteriorIndex (the pre-pass raises it first for every composite). - per-node alias count is re-derived in three sites (signature_of base, leaf_has_unaliased_param, signature_base_len). refs #45
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