[connerkup]

Automated Steward Delivery — STW-SHIELD-4A4A-1

Task: Fix Interval NaN/non-finite bounds bypass and nested bracket parsing in static verifier
Layer: core_logic
Scope-Locked Target Files: packages/core/src/solvers/interval.ts, packages/core/src/static-verify.ts, packages/core/src/solvers/solvers.test.ts

Specification

[CORE_LOGIC] Reject non-finite bounds (!Number.isFinite) and non-2-element arrays in Interval constructor and Interval.from, validate non-negative transfer amounts in analyzeLedgerSafety, and replace the non-greedy /[[\s\S]*?]/ regex in parseBracketBlock with balanced bracket depth parsing so nested interval arrays like [40, 60] are not truncated.
Target Files: packages/core/src/solvers/interval.ts, packages/core/src/static-verify.ts, packages/core/src/solvers/solvers.test.ts
Acceptance Criteria: All existing and new unit tests in solvers.test.ts pass via npm test && npm run build, covering NaN bounds, negative transfer amounts, and nested interval bracket parsing.
Evidence: concrete_bug_or_edge_case @ packages/core/src/solvers/interval.ts:5-17

Anti-Slop & Verification Receipt

• Deterministic Gate: Passed target_files scope lock, secret & anti-slop gates (3 files, 169 diff lines).
• 5-Point Anti-Slop Rubric: 5/5 Passed (Score: 100/10)
  • zero_unrequested_abstractions: True
  • zero_cosmetic_churn: True
  • zero_silent_error_swallowing: True
  • non_tautological_tests: True
  • minimal_loc_solution: True
• Critic Audit Rationale: The diff cleanly and concisely implements all requirements of STW-SHIELD-4A4A-1 across the specified target files:

1. Interval constructor validates Number.isFinite(min) and Number.isFinite(max) in addition to min <= max, preventing NaN and Infinity bypasses.
2. Interval.from enforces value.length === 2 for array inputs before constructing the interval.
3. analyzeLedgerSafety rejects negative transfer amounts (amount.min < 0) so negative transfers cannot inflate the sender's balance.
4. parseBracketBlock replaces the non-greedy regex /\[[\s\S]*?\]/ with balanced bracket depth tracking (consistent with parseBracedBlocks in the same file) so nested interval arrays such as [40, 60] are parsed intact.
5. Unit tests in solvers.test.ts thoroughly verify NaN/infinite bounds, non-2-element arrays, negative transfer amounts, and both unit and end-to-end static verification of nested bracket blocks without mock theater or cosmetic churn.

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[connerkup]

Folded STW-SHIELD-4A4A-1 (bff0550) into the team integration branch steward/dev (#37) to unblock downstream DAG tasks.