docs(tui): align frontend protocol references on stack

[lawrencecchen]

Summary

• replay PR docs(tui): align frontend protocol references #10246 frontend protocol docs and contract test on integrated TUI stack head 162c188fe244
• preserve the red/green commit order
• keep the spec workflow contract check wired

Base and history

• base: 162c188fe24455a95a108879a355f52f358496d6
• red commit: 1d9552e6e6
• green commit: cb8d6eb982
• source PR: docs(tui): align frontend protocol references #10246

Verification

• frontend docs contract
• Python compile check
• inventory, SDK schema, resource-boundary, and codegen checks
• PyYAML workflow contract and actionlint

No merge, tag, package publication, or build was performed.

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Summary by cubic

Aligns TUI frontend README protocol references to v12 and adds a CI test that prevents version drift. Previously READMEs cited v7/v10 with no check; now they cite v12 and the spec workflow fails if docs diverge from the supported wire API.

• Adds cmux-tui/scripts/test_frontend_docs.py to assert that SUPPORTED_PROTOCOL in the web frontend, cmux-tui/docs/protocol.md, and all frontend READMEs reference the same protocol version.
• Runs the new test in .github/workflows/cmux-tui-spec.yml.
• No runtime or SDK changes; documentation and CI only.

Rollout

• When bumping the wire protocol, update SUPPORTED_PROTOCOL, cmux-tui/docs/protocol.md, and README protocol lines; CI will fail if they are inconsistent.

^{Written for commit cb8d6eb. Summary will update on new commits.}

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