docs: verify the released command surface

[solnikhil]

Summary

• distinguish next-release documentation on main from immutable released docs
• update the M4 publisher guide to use the shipped di setup workflow
• remove the fictional verify --json reference-consumer claim
• add a production docs verification gate that checks CLI help and executes the reference producer
• make the release runbook verify docs and GitHub/npm release parity

Verification

• npm test (124 security tests + 244 exhaustive tests + docs contract)
• npm run verify:package
• git diff --check

Closes #22

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