[seonghobae]

Final disposition

The generated change replaced for key in sorted(mapping) plus a value lookup with sorted(mapping.items()) in two page-building loops and called that a performance improvement. Fresh review found no reproducible benchmark/profile, production workload identity, allocation/heap/GC evidence, runtime/CPU identity, warm-up/repetition policy, or buyer-path p95 evidence. Unit/coverage success is behavioral evidence, not performance evidence, and the tuple-sorting form has its own allocation/indirection trade-off.

The generated repository-wide .jules/bolt.md rule had already been restored to protected-base content. Normal descendant 847ee4fbba0e65b19cde23db8c4903e3ceef446a now also restores src/newsdom_api/dom_builder.py to the exact protected develop@e06b1f3fb10903569124af011da213951e6e2473 blob without rewriting history.

Fresh protected-base → final-head comparison is ahead_by=3, behind_by=0, files=[]; the final tree is exactly the protected-base tree. The experimental commits remain in ancestry, but there is no surviving production, test, fixture, contract, documentation, or performance-evidence delta to integrate.

This therefore qualifies for closure under the no-valid-delta rule. No predecessor GREEN, force-push, destructive rebase, self-approval, bypass, no-op gate result, or unmeasured performance claim is used as acceptance. If page construction later proves to be a material buyer-path hot spot, reopen the problem from measured workload/profile evidence rather than reviving this unverified micro-optimization.

[google-labs-jules]

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[cwl-noema-review]

Noema LLM review

The PR replaces for page_idx in sorted(dict): ... dict.get(page_idx) patterns with for page_idx, value in sorted(dict.items()) in two places in dom_builder.py, eliminating redundant O(1) hash map lookups. Verified that this preserves exact iteration order (keys are unique, so tuple comparison short-circuits on the key) and yields the identical value objects. The .jules/bolt.md change is purely a learning-log documentation entry. No behavioral, security, or maintainability regressions were introduced.

Reviewed changed lines

• src/newsdom_api/dom_builder.py:389 (RIGHT): Replaced for page_idx in sorted(page_info_by_idx): page_info = page_info_by_idx.get(page_idx, {}) with for page_idx, page_info in sorted(page_info_by_idx.items()). Since dict keys are unique, tuple comparison compares only the integer keys, preserving the same sort order as sorted(page_info_by_idx). The unpacked page_info is the exact value from the dict, identical to what .get(page_idx, {}) would return (the key always exists).
• src/newsdom_api/dom_builder.py:429 (RIGHT): Replaced for page_idx in sorted(blocks_by_page_idx): ... blocks_by_page_idx[page_idx] with for page_idx, blocks in sorted(blocks_by_page_idx.items()). The unpacked blocks is the same list object previously retrieved by lookup. The page_info_by_idx.get(page_idx, {}) call and page_number computation remain unchanged, preserving exact behavior.

Adversarial validation

• src/newsdom_api/dom_builder.py:389 (RIGHT) falsified: sorted(page_info_by_idx.items()) produces the same iteration order and page_info values as sorted(page_info_by_idx) followed by .get(page_idx, {}). — Dict keys are strictly unique integers, so tuple comparison always short-circuits on the first element. For page_info_by_idx = {3: {...}, 1: {}, 2: {...}}, sorted(page_info_by_idx) gives keys [1,2,3]; sorted(page_info_by_idx.items()) compares (1,{}), (2,{...}), (3,{...}) and yields the same key order. Unpacking gives the identical value for each key as the previous .get() because the key exists.
• src/newsdom_api/dom_builder.py:429 (RIGHT) falsified: Replacing blocks_by_page_idx[page_idx] with the unpacked blocks variable preserves the exact same list object and page_info computation behavior. — For blocks_by_page_idx = {1: [blockA], 2: [blockB]}, sorted(blocks_by_page_idx.items()) yields tuples (1, [blockA]), (2, [blockB]) in the same key order. Unpacking returns the exact list objects bound to each key. No copying, reordering, or mutation occurs. The page_info lookup via .get() and the page_number computation are unchanged.
• Residual risk: No residual risk identified. The change is a mechanical refactor that eliminates dictionary lookups; iteration order and value references are provably identical. The accompanying documentation change has no runtime effect.

Findings

• No blocking findings.

• Result: APPROVE
• Head SHA: 2c5e9912383c545c72f7d3734db5394b2b55416a
• Reviewer credential: noema-review-github-app-refresh
• Actor: cwl-noema-review[bot]