SOURCE_DIGEST: 9db301b5b5f0c3a2844062ca6f5f67309bce2cb5d40bd2e68e08ed8374b04bd1

I have completed the Round 2 review of the CatDB Paper 2 manuscript, acting as the paper-specific adversarial, domain, database-systems, query-compilation, and reproducibility reviewer.

**Verification of Round-1 Corrections:**

1. **Portable Decimal Codec:** Verified. Section 10.2 rigorously defines the bounded `Decimal64(p,s)` codec. It correctly specifies the storage representation (a signed 64-bit integer mantissa for SQLite), explicitly delegates scale to the immutable type rather than text parsing, and strictly bounds exact comparison pushdown to matching $(p,s)$ domains. Rejection of unsafe scale changes, overflow, and arbitrary textual collation has been appropriately addressed.
2. **Semantic Cache Dependency Closure:** Verified. Section 13.2 (Definition 13.1) and Section 13.3 detail the semantic cache key's dependency on a referenced closure. The text now clearly establishes that an unrelated schema edit no longer forces a global flush, but reuse is safely gated by a dependency validator emitting a compatibility witness to prove the referenced subset is unchanged.
3. **Lineage Modes and Overhead Measurements:** Verified. Section 15.2 introduces explicit lineage modes (`RequiredAtoms`, `RequiredNormalized`, `NoneAllowed`) and forbids connectors from silently downgrading the requested mode. Section 17.7 explicitly renounces any "zero-cost" assumptions, requiring early fixtures to record added columns, bytes, allocations, and latency overheads.

**Re-Audit of Core Claims and Boundaries:**
- **IR/Lowering Contracts:** The abstract finite-bag relational core, normalizations, and the exact lowering theorem (Proposition 9.2) are mathematically bounded and do not conflate abstract operators with specific SQL dialect behavior. 
- **Evidence Cut & P1/P2 Separation:** The manuscript's evidence cut meticulously segregates the inherited theoretical framework of P1 (schema definitions) from the currently absent P2 engineering evidence (Rust query crates, SQL generation, measured plans). Table 1 and Section 17 are completely transparent.
- **Hot-path and Performance Nonclaims:** Claims of "outside the hot execution path" are appropriately classified as an engineering hypothesis, to be evaluated by the rigorous falsification criteria in Section 16.7. Pre-registered targets are clearly marked as thresholds, not observed results.
- **Falsifiability:** The test matrix in Table 6 sets excellent, testable criteria for cache transitions, semantic parity, and hot-path violations.

**Conclusion:**
All requested revisions have been successfully implemented. The manuscript's engineering hypotheses are precisely specified, testable, and insulated from premature correctness or performance claims. No actionable major or minor findings remain.

VERDICT: ACCEPT