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retroDE_ps2/docs/decisions/0005-phase0-source-of-truth.md
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thejayman77 ec82764bef Initial commit: retroDE_ps2 — first-of-its-kind PS2 GS FPGA core (DE25-Nano / Agilex 5)
RTL (GS rasterizer, EE core stub, platform bridge, LPDDR4B path), sim regression
(272 TBs), docs, and tooling. Copyrighted PS2 content (BIOS, game code, GS dumps,
and all dump-derived textures/traces) is excluded via .gitignore and stays local.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-29 20:10:50 -04:00

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# Decision 0005: Phase 0 Source of Truth
Status: `Locked`
## Context
`docs/phase0_checklist.md` began as an options menu. Once the Phase 0 decisions
were locked, the project needed one clear rule for which document is
authoritative.
## Decision
Decision records under `docs/decisions/` are the source of truth for locked
Phase 0 choices.
`docs/phase0_checklist.md` remains useful, but only as a progress and navigation
document. When a checklist item is locked, it should point to the corresponding
decision record.
## Consequences
- The checklist can stay concise.
- Locked decisions are not duplicated as prose in multiple places.
- Future changes to posture, BIOS policy, milestone definition, or validation
policy should update the decision records first.