Add guest post on publishing approved creative assets

[FosterMartyn735]

Proposed changes

Adds a guest best-practices post that shows a narrow TypeScript Pulumi pattern for publishing approved creative assets to a versioned, access-controlled S3 bucket.

The post includes:

• a complete Pulumi TypeScript example using S3 versioning and a scoped IAM role policy;
• explicit boundaries between creative generation, human approval, and infrastructure publishing;
• operational limitations covering approval enforcement, lifecycle cost, licensing, and brand review;
• one disclosed supporting example of an independent third-party visual drafting tool;
• a guest author profile for Foster Martyn.

The title is under 60 characters and the article uses existing categories and tags. A feature image is intentionally omitted; design support is welcome if the post is accepted.

Validation

• Article body: 926 English words
• Markdown link preview checked
• Product relationship disclosure included
• No claims of a tested integration, customer result, pricing, performance, or affiliation

Unreleased product version (optional)

Not applicable.

Related issues (optional)

None.