Merge develop into candidate

[nileshnegi]

Motivation

Sync urgent fixes and doc changes from develop into candidate

Technical Details

Test Plan

Test Result

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[Copilot]

Pull request overview

This PR syncs develop into candidate by bringing in a host-accessibility fix for reading GPU sub-executor parameters (to support systems where host cannot directly read GPU allocations) and a substantial documentation reorganization/expansion to improve end-user guidance.

Changes:

• Add host-accessibility detection for GPU allocations and fall back to copying SubExecParam to host when needed.
• Expand and restructure Sphinx documentation (new conceptual/how-to/reference pages, updated TOC and index).
• Update license year.

Reviewed changes

Copilot reviewed 14 out of 27 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/header/TransferBench.hpp	Adds GetMemHostAccessibility(), tracks subExecParamHostAccessible, and conditionally copies GPU sub-exec params to host for per-iteration CU/timing data; adds an extra device sync during SRC buffer initialization.
LICENSE.md	Updates copyright year to 2026.
docs/what-is-transferbench.rst	Adds a new high-level overview page.
docs/sphinx/_toc.yml.in	Reorganizes the documentation TOC and adds new sections/pages.
docs/reference/transfer-definition-syntax.rst	Adds detailed transfer definition syntax reference.
docs/reference/presets.rst	Adds an extensive presets reference page.
docs/reference/faq.rst	Adds a FAQ page covering common issues and warnings.
docs/reference/environment-variables.rst	Adds a consolidated environment variables reference.
docs/install/install.rst	Removes the prior install page (replaced by new build-from-source doc).
docs/install/build_from_source.rst	Adds a new build-from-source guide (Makefile + CMake).
docs/index.rst	Updates doc landing page content/links to match the new structure.
docs/how to/running-transferbench-customized.rst	Adds a how-to guide for running custom tests (config/cmdline/dryrun).
docs/conceptual/transferbench-workflow.rst	Adds conceptual overview of backend workflow phases.
docs/conceptual/transferbench-timing.rst	Adds conceptual explanation of timing methodology.
docs/conceptual/transferbench-data-validation.rst	Adds conceptual explanation of correctness validation.

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