docs: research DPDK packet-path tradeoffs

[div0rce]

Summary

• Add docs/dpdk_research.md to separate DPDK packet-path research from measured kernel-socket evidence.
• Add non-mutating make dpdk-check / scripts/dpdk_environment_check.sh support check.
• Record results/dpdk_environment.txt as an unsupported-host macOS artifact with source-digest provenance and Dirty inputs: no.
• Update README, Linux/socket docs, results policy, and project memory command lists for the new check.

Definition of Done

• Research distinguishes what was measured from what was only studied.
• Prototype is optional and only if environment support exists.
• Docs explain why this remains late-stage research rather than core project evidence.
• make check passes; PROGRESS.md updated.

Tests / Validation

• bash -n scripts/dpdk_environment_check.sh
• make dpdk-check
• git diff --check main...HEAD
• make check (232/232 native macOS)
• CodeScene pre-commit safeguard: passed
• CodeScene change-set analysis against main: passed

Evidence

results/dpdk_environment.txt reports:

• Evidence class: unsupported-host
• Device binding performed: no
• Hugepage setup performed: no
• Packet-path benchmark ran: no
• Prototype compiled: no
• Source digest: sha256:b2d79e329b8274dfa478e5226426af4a379c54e3d6def042dc448609af1cfa53
• Dirty inputs: no

Limitations

• No DPDK packet-path benchmark is claimed.
• No kernel-bypass latency, throughput, or speedup claim is made.
• The current development host is macOS, so M48 records research and environment gating only.
• A DPDK prototype remains optional and should only be added on a host with suitable Linux, DPDK development files, hugepages, and intentionally managed device binding.

Review Notes

A bounded local codex review --base main attempt reached its 120-second alarm after starting internal CodeScene analysis and produced no final findings. Repository CodeScene gates completed separately and passed.

[codescene-delta-analysis]

No application code in the PR — skipped Code Health checks.

See analysis details in CodeScene

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: c84eebfb-4845-4ae0-b131-e4688ae28ac0

📥 Commits

Reviewing files that changed from the base of the PR and between 548cb68 and b86c6bc.

📒 Files selected for processing (12)

• AGENTS.md
• CLAUDE.md
• MILESTONES.md
• Makefile
• PROGRESS.md
• README.md
• docs/dpdk_research.md
• docs/linux_performance.md
• docs/socket_profiling.md
• results/README.md
• results/dpdk_environment.txt
• scripts/dpdk_environment_check.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/m48-dpdk-research-prototype

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