docs: mark spec as superseded by VROOM-Terminal

[visionik]

Adds a banner at the top of the README noting that this spec has been superseded.

• Terminal protocol → VROOM-Terminal
• Underlying OpenMUX transport work → xumux.org

This repository is kept for historical reference only.

[greptile-apps]

Greptile Summary

This PR adds a deprecation banner to the top of README.md pointing readers to VROOM-Terminal and xumux.org, and updates the Status field to Draft (superseded). The change is documentation-only with no code or logic impact.

Confidence Score: 5/5

Safe to merge — documentation-only change with no code impact.

The PR makes a single, clear documentation update with no logic, configuration, or dependency changes. No issues found.

No files require special attention.

Important Files Changed

Filename	Overview
README.md	Adds a superseded banner and updates Status field to "Draft (superseded)" — documentation-only, no logic changes

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Reader visits socketpipe README] --> B{Sees superseded banner}
    B --> C[VROOM-Terminal\ngithub.com/deftai/vroom]
    B --> D[OpenMUX transport\nxumux.org]
    B --> E[Historical reference\nthis repo]

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