chore(main): release 0.15.0

[kong-volcano-app]

🤖 I have created a release beep boop

0.15.0 (2026-10-16)

Features

• durable: wait for, publish, send, and subscribe to durable messages (#391) (dda9a6a)

Bug Fixes

• sandboxes: sync runtime billing API contract (#392) (8a91a03)

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[github-actions]

AI review: no P0-P2 findings

Reviewed e4300a3. Run log

This is the Release Please PR for 0.15.0. It bumps the version from 0.14.0 to 0.15.0 in .release-please-manifest.json, pyproject.toml, and uv.lock, and adds a CHANGELOG entry for the durable-messages feature (#391) and the sandboxes billing fix (#392). The three version strings match, and no other file still says 0.14.0. The changelog lists the user-facing commits made since v0.14.0, and a minor bump fits a pre-1.0 release that adds a feature. Risk is low.

Not checked: The AI review read the diff, the code, and the PR's text; it ran no tests or builds and read nothing outside this repository.

• Whether the release workflow that runs after merge publishes 0.15.0 to the package index, and tags it correctly.

Human review: not needed