ci: add root level tasks to lage

[Saadnajmi]

Description of changes

We have some tasks that run per pacakge (build, lint, etc), and some that run at the workspace level (lint-lockfile, format because its way faster that way, etc. We didn't clearly delineate these two types of tasks and Lage would get confused when I tried to. So, I asked Claude to do it.

Claudes summary of the changes below

Add root-level tasks to lage pipeline

Problem

Several repo-wide checks (format:check, lint-lockfile, check-publishing) were running as standalone CI steps outside of lage, or not running at all through lage's task scheduler.

Changes

package.json

• Added "." to workspaces so lage discovers the root package as a workspace, enabling root-only tasks
• Added "lint-lockfile": "lint-lockfile" script (required for lage to invoke it as a pipeline task)
• Removed scripts whose names collide with lage task/alias names (buildci, bundle, clean, lint, lint-package, test) — these caused infinite recursion because lage would invoke the script, which invoked lage again. Scripts that call lage but don't match a task name (lint-fix, lint-package-fix, build) are kept

lage.config.js → lage.config.mjs

• Converted to ESM
• Added three root-only pipeline tasks with cache: false (using **/* inputs at the repo root would OOM from hashing the entire monorepo): check-publishing, format:check, lint-lockfile
• Added repo-checks alias grouping the three root-only tasks — they run once at root instead of being spawned per-package
• Added repo-checks to buildci
• Removed format from the pipeline — sub-packages each have a format script, so lage format would spawn 80+ processes; yarn format at root already runs oxfmt over the whole repo in one shot
• Removed pr-check alias — unused and redundant (was a subset of buildci)
• Reorganized pipeline into labelled sections: per-package tasks, root-only tasks, pipeline aliases, worker tasks

.github/workflows/pr.yml

• Removed standalone Check formatting and Run lint-lockfile steps — both are now covered by buildci via repo-checks
• Changed yarn buildci → yarn lage buildci (root no longer has a buildci script)

Verification

CI should pass

Pull request checklist

This PR has considered (when applicable):

• Automated Tests
• Documentation and examples
• Keyboard Accessibility
• Voiceover
• Internationalization and Right-to-left Layouts

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