Runtime sources Playground integration cannot connect to SQLite in CI

[chubes4]

Problem

The contracts workflow fails consistently in npm run test:runtime-sources-playground-integration while booting the recipe runtime:

WordPress Playground CLI exited while booting the runtime with exit code 1.
Error: Error connecting to the SQLite database.

The component sources are prepared and mounted successfully, but no recipe execution begins because runtime startup cannot connect to SQLite.

Evidence

• Failed job: https://github.com/Automattic/wp-codebox/actions/runs/29786681289/job/88499606158
• Failed rerun: https://github.com/Automattic/wp-codebox/actions/runs/29786681289/job/88499899439
• Both failures occur at the same test and runtime startup boundary.
• The PR changes only packages/runtime-cloudflare, Cloudflare scripts/tests/assets, and does not change the runtime-sources or Playground SQLite path relative to its previously pushed head.

Expected

The integration fixture should boot its Playground SQLite runtime deterministically, or expose the underlying SQLite initialization diagnostics needed to identify fixture/environment failures.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode with OpenAI GPT-5.6 Sol
• Model: openai/gpt-5.6-sol
• Used for: Reproduced the CI failure, inspected both job logs, and isolated the failing runtime boundary with Chris Huber.

[chubes4]

Resolved upstream by #1922 (5b331b8d), which keeps runtime environment injection scoped to external-database runtimes and avoids forcing wordpressInstallMode for downloaded WordPress. This is the causal startup-path correction; it retained the existing Playground dependency versions. The exact test:runtime-sources-playground-integration gate passes in four consecutive main contract runs: https://github.com/Automattic/wp-codebox/actions/runs/29825684582, https://github.com/Automattic/wp-codebox/actions/runs/29829923575, https://github.com/Automattic/wp-codebox/actions/runs/29834721446, and https://github.com/Automattic/wp-codebox/actions/runs/29837663878.