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Codex/GPT-native, local-first public demo/runtime port of the AITax Singapore corporate-tax computation pipeline.
AI Engineer Hackathon (2026-05) build: local CLI, a hand-built Obsidian tax-law knowledge graph (ITA sections + concepts + treatments + a generated graph), structured GPT extraction/classification, deterministic YA2025 compute, static workbench, 30 passing tests, and a post-hackathon accountant-review gate.