gitignore .phpstorm.meta.php — it bakes absolute worktree paths and churns every PR diff

[edgrosvenor]

.phpstorm.meta.php is regenerated by composer ready (ide-helper) with absolute worktree paths baked in, so it shows up as a modified file in essentially every PR diff and after every gate run. It's editor metadata, not source.

Fix: add .phpstorm.meta.php to .gitignore and git rm --cached .phpstorm.meta.php.

Surfaced repeatedly during the initial 9-step build (flagged as an advisory in the inbox-UI and docs PRs). The sibling repos artisan-build/hone and artisan-build/matte likely carry the same artifact and would benefit from the same change.