docs: CMO belt + three-clip inbox

[DealAppSeo]

CMO belt now-list and filming inbox brief. No HeyGen. No stake. Ready when the three phone clips exist.

[strix-security]

Strix Security Review

No security issues found.

Review summary

Reviewed the single changed file in this PR, skills/belts/CMO.md, a new documentation file containing marketing workflow and publishing guidance. The change is documentation-only with no executable code, no sensitive data, no hardcoded credentials, and no security-relevant logic. No vulnerabilities were identified.

_{Updated for 1a44231.}

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Reviewed by Strix
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Project	Deployment	Actions	Updated
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[strix-security]

Reviewed the single changed file in this PR, skills/belts/CMO.md, a new documentation file containing marketing workflow and publishing guidance. The change is documentation-only with no executable code, no sensitive data, no hardcoded credentials, and no security-relevant logic. No vulnerabilities were identified.

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Reviewed by Strix
_{Configure security review settings}