Fix comments and documentation

[derobins]

• Say in hipobj.h that hipObjInit() reads the environment, so it mustn't run while another thread changes it, and that a callback must return on the thread that called it. Assert in debug builds that a thread's count of connection leases doesn't go below zero.
• Say in hipobj.h that a staging copy that timed out keeps calls that start after it from using the buffer, rather than that the buffer can't be used, since calls already in progress aren't stopped.
• Correct the comment in BufferMap::deregisterBuffer() about where copies of a buffer's entry are made.
• List every package the MinIO bridge build needs in building.rst.
• Say in interop.rst that the client's and server's MTUs must match, since hipObject doesn't negotiate a path MTU.
• Mention the GET that sometimes hangs in the two-VM GPU lane's known-failure summary.

[Copilot]

🟢 Approval recommended

Only a minor documentation correction about optional dependencies remains; no blocking issues were identified.

1 open issue

• Correctly distinguish required packages from dependencies with fallbacks · New

What changed in this PR

Clarifies hipObject’s caller requirements, build dependencies, and RDMA interoperability guidance, with a debug assertion for lease accounting.

Changes:

• Clarifies threading and timed-out staging-copy behavior.
• Documents bridge dependencies, MTU requirements, and a known CI hang.
• Adds a lease-count assertion and corrects an ownership comment.

File	Description
src/​rdma/​connection-pool.cpp	Adds a debug lease-count assertion.
src/​buffer.cpp	Corrects the buffer ownership comment.
include/​hipobj.h	Clarifies threading and buffer-use requirements.
docs/​interop.rst	Documents matching MTU requirements.
docs/​building.rst	Expands MinIO bridge dependency guidance.
CHANGELOG.md	Records clarified requirements and limitations.
.github/​workflows/​hipobject-hardware-test-two-vm-gpu-direct.yml	Documents an intermittent GET hang.

_{Review effort: Balanced}

[github-actions]

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