#1127 hip: rebased support for Radeon gfx1151 APUs

Description

## 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.