[lancewillett]

Restore forwarding of arguments passed to npm run env:start -- ... to Composer. The change in r65150 moved Composer into start.js but omitted those arguments. For example, npm run env:start -- --dry-run must pass --dry-run to composer update -W.

Follow-up to #9360. Trac ticket: https://core.trac.wordpress.org/ticket/62807

Verification used the real npm script with a recording Docker stub: no arguments, one argument, and multiple arguments reach Composer as expected. Retry success, persistent failure, and failed container startup retain their exit behavior. Syntax, JSHint, and diff checks passed. The probe did not run real Composer or Docker.

AI assistance: Codex (gpt-6) prepared the one-line fix and controlled verification.

[github-actions]

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🟢 Approval recommended

No active review issues block the change restoring command-line argument forwarding to Composer.

No open issues 🎉

What changed in this PR

Restores forwarding of npm run env:start -- ... arguments to Composer, fixing an omission introduced when Composer execution moved into start.js in #9360.

Changes:

• Appends command-line arguments to composer update -W while retaining the existing retry and error-handling flow.

File	Description
tools/​local-env/​scripts/​start.js	Forwards additional command-line arguments to Composer.

_{Review effort: Balanced}