Review go-no-go for first beta tag

[Zhortein]

Objective

Record the go/no-go decision for the first beta tag.

Scope

Review:

• smoke test status;
• blocker status;
• public API review;
• changelog status;
• Composer/Packagist metadata;
• CI status;
• QA status;
• frontend test status;
• documentation status;
• known limitations;
• final tag name.

Proposed tag

v0.3.0-beta.1

Acceptance criteria

• Go/no-go decision is recorded.
• Known limitations are explicit.
• Release tag is confirmed.
• CI is green.
• QA is green.