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Summary

Focused rebase of the remaining changes from #895 onto the repository's
rewritten main.

Most gfx1151 support is already present in current main, including Strix Halo
detection, unified-memory accounting, compilation support, Windows packaging,
setup integration, kernel compatibility, and documentation.

This PR retains the two pieces that were still missing:

• preserve Q2_0 signed zero on gfx1151 HIP compilers when a negative scale is
  multiplied by code zero;
• add the Radeon 8060S hipBLASLt 1.5.0 (100500) tuning table calibrated with
  AMD's 2026-10-04 nightly SDK.

It also corrects the setup/install documentation to name experimental Strix
Halo support consistently.

Validation

The original changes were validated on:

• Ryzen AI Max+ 395;
• Radeon 8060S (gfx1151);
• 128 GB unified memory;
• 116.0 GiB GPU-addressable GTT pool;
• HIP runtime 7.17.26392;
• hipBLASLt 1.5.0.

The tuning table's smoke test exercised BF16 and F16 rows with outputs matching
hipBLASEx and fallbacks=0. End-to-end prompt performance with this specific
1.5.0 table was not measured.

After rebasing:

• python tools/test_setup_amd.py: 30 tests passed;
• python tools/test_setup_strix_halo.py: 34 tests passed;
• git diff --check: clean.

AI assistance disclosure

Implementation review, documentation preparation, and commit organization were
assisted by AI. Hardware builds, GPU tests, and reported measurements were run
on the Radeon 8060S system described above.

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Had been implemented in current Head