docs: clarify release distribution status

[SetraTheXX]

Summary

• clarify that v0.14.0-beta.0 is currently a GitHub prerelease while npm still serves v0.7.0-beta.0
• use a source checkout for the current Quick Start
• state that the Codex plugin is source-marketplace installable and is not in a bundled or curated global catalog

Validation

• focused release, contributor, repository hygiene, and stable-core contracts
• npm run pack:dry-run
• git diff --check

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[chatgpt-codex-connector]

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Reviewed commit: 986cf60ccc

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[chatgpt-codex-connector]

Keep the CLI invocable after switching to a checkout

For a user starting from a clean machine, these commands only execute the script directly; init copies skills but does not install or link the package's cewp binary. Consequently the Quick Start reaches line 64 and fails with cewp: command not found, and it also provides no usable invocation after changing into the disposable target repository. Either add a global/link installation step or consistently invoke the checkout's script with a path that remains valid from the target repository.

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