Publish Chimera GFX source

docs/retroarch/phase-1.0ax-canary-protocol-model.md

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+# Phase 1.0AX: host-only AV protocol and cleanup model
+
+Status: `HOST_REFERENCE_MODEL_COMPLETE_TARGET_SOURCE_AND_ARTIFACT_BLOCKED`
+
+Date: 2026-07-29
+
+AX turns AW's source requirements into an exact bytes-only reference model.
+Frames remain 64-byte, big-endian and CRC-bound over the first 60 bytes, but
+use `CHD10AV1`. Historical wire values are preserved and D14 is appended at
+stage value 30. D12 cannot carry the terminal flag; only a final D14 can.
+
+D14 records the current initialized mask, cleaned mask, `rarch_main` result,
+cleanup-order errors and the independent cleanup-failure count. It is generated
+only when `rarch_main` returned, D04 was emitted, phase S15 was reached, no
+subsystem remains initialized and both cleanup error counts are zero.
+
+The trace layer requires exactly one D07, D04 and final D14 in that order,
+strictly increasing sequence values, at most one D12 and no post-terminal data.
+All 64 single-byte mutations fail CRC or canonical parsing. Correctly
+rechecksummed but false cleanup claims also fail.
+
+This is Python byte processing only. It creates no target profile, source,
+artifact, socket, process, output file, address or authorization. Passing it
+proves neither target equivalence nor firmware behavior.