Publish Chimera GFX source

docs/retroarch/phase-1.0br-script-entrypoint-one-shot-gate.md

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+# Phase 1.0BR: script-entrypoint one-shot gate
+
+Status: `EXACT_SCRIPT_ENTRYPOINT_AUTHORIZED_ONCE_SDL_ONLY`
+
+Date: 2026-07-29
+
+The exact argument-free BQ entrypoint is source-audited and hash bound. It adds
+only the repository import root, calls the already bound `run_once` exactly
+once and prints JSON. The production output paths remain absent.
+
+BR grants one new materialization attempt through the script path, without an
+inline shell expression. This is a separately reviewed permission, not a retry.
+Any failure consumes it. No cleanup, resume or automatic retry is permitted.
+The scope ends at the retained SDL archive; RetroArch and every PS5 action stay
+unauthorized.