[ilehtoranta]

Mainline's general logical handler already supports Detroit's EORI postincrement cases. Add ten sparse-bus regression witnesses and prepare the frozen, unpublished 1.5.4-qualified-dev.1 candidate without adding a duplicate production execution path.

The witnesses verify results, CCR, exact PC, register preservation, access sizes, guard memory and A7 byte stride. Production CPU execution code is unchanged.

Validation:

• Full CPU suite: 5,393 passed, zero failed; 109 unavailable/deferred.
• Synthetic gate: 86,663,530 required logical cases in 783 batches; zero required mismatches, unsupported forms or untested combinations.
• Focused CPU/AGA regressions: 230 passed; AHX: 18 passed.
• Exact-package consumer validation: Release build with zero warnings/errors; host 195 passed / 6 unavailable, disk 74 passed, engine 1,183 passed / 7 unavailable, explicit-ROM native CPU group 4 passed.
• Detroit: both normal and scalar modes completed 34,000 fields; 1,027 captures per mode with matching fingerprints. Inspected first-month financial report and February management screen.

The CPU DLL was verified byte-identical across CPU tests, the frozen NuGet package and consumer outputs. Detailed evidence and hashes are in docs/COPPER68K_QUALIFIED_DETROIT_INTEGRATION_2026-10-11.md and its JSON record.

Five deferred qualification areas remain visible and the roadmap is not marked complete. This does not add hardware, external-reference or throughput qualification. No NuGet publication is included; this draft preserves the separately authorized release boundary.