[codex] prepare public release harness docs

[yourconscience]

Summary

• add README integration-table notes for Amp, OpenCode, and OpenClaw as compatibility-only / non-managed surfaces
• remove retired cmux omx and cmux omo launcher references from the cmux skill and rendered dotagents plugin mirror
• clarify the public-release spec so M-pre and M1 checks are executable for managed and compatibility-only harnesses
• keep local M0/M1 verification artifacts ignored and out of the PR

Validation

• git diff --check
• grep -rn --include="*.md" "omx" README.md skills/ plugins/dotagents/skills/ -> no hits
• tmp/verify-harnesses.sh -> pass=8 fail=0
• dotagents status --skip-package-age
• GitHub Actions CI run 336 -> success

Review follow-up

• Addressed and resolved Gemini/Codex bot review threads on SPEC.md.
• No human review threads are open.

[gemini-code-assist]

Code Review

This pull request prepares the repository for public release by adding a detailed release specification (SPEC.md), updating the compatibility table in README.md to include Amp, OpenCode, and OpenClaw, and removing references to retired launchers (omx and omo) in the cmux skill documentation. The reviewer suggested optimizing the history audit command in the specification to filter out duplicate and empty lines for efficiency.

Important

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[chatgpt-codex-connector]

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