ROCR: document hotswap debug instrumentation architecture

[harsh-amd]

Summary

• Add a ROCR design note for a separate opt-in hotswap debug instrumentation mode.
• Define dispatch, entry-wrapper, and per-site diagnostic modes.
• Split responsibilities between ROCR runtime policy/resources and COMGR instruction-level instrumentation.
• Document host-known cluster metadata versus device-time hardware reads, including the production B0 use of the documented IB_STS2 cluster-id source.
• Clarify that dispatch packet metadata capture is opportunistic unless the packet path is ROCR-visible, and that production strict-mode correctness must stay independent of debug mode.
• Document compatibility and failure policy for future debug flags/options.

Validation

• Docs-only change.
• Ran git diff --check on the touched RST files.

[therock-pr-bot]

❌ PR Check — Action Required

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