chore: migrate biome.json to 2.x schema

[coderdan]

Problem

Root package.json pins @biomejs/biome@^2.4.15, but biome.json still declared the 1.8.3 schema. biome 2.x renamed files.ignore → files.includes (with negated globs), so the installed biome refuses to parse the config at all:

× Found an unknown key `ignore`.
× Biome exited because the configuration resulted in errors.

This breaks every biome entry point locally — pnpm code:fix (biome check --write) and the per-package lint scripts (biome check .) all fail before checking a single file. The binary was bumped to 2.x without migrating the config.

Fix

Ran biome migrate to convert the config to the 2.4.15 schema:

• $schema → 2.4.15
• files.ignore: [...] → files.includes: ["**", "!...", ...] (biome 2.x's negated-glob form)
• Adopted biome's own recommended folder-ignore form (!**/nix/store instead of !**/nix/store/**)

Faithful, behavior-preserving config migration — no lint rule changes. biome check biome.json now validates with zero warnings.

Scope / impact

• No CI impact. biome is not invoked in any workflow (CI's lint:* steps are custom node scripts, not biome) — this only restores the local dev tooling.
• biome 2.x does surface a backlog of pre-existing findings (it couldn't run before, so they were invisible). Addressing those — biome check --write for the auto-fixable formatting/import-sort changes, plus manual review of the rest — is intentionally out of scope for this config fix and should be a follow-up.

Verification

• biome check biome.json → valid, 0 warnings
• biome check now runs across the repo (previously crashed on config parse)

Summary by CodeRabbit

• Chores
  • Updated code quality tool configuration to use the latest schema version and adjusted file inclusion patterns to optimize coverage while excluding specific directories.

[changeset-bot]

⚠️ No Changeset found

Latest commit: f146e6e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 62cc4e1b-0b5d-4e5d-a843-74006657ed03

📥 Commits

Reviewing files that changed from the base of the PR and between 917b5c0 and f146e6e.

📒 Files selected for processing (1)

• biome.json

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📝 Walkthrough

Walkthrough

biome.json is updated to reference Biome schema version 2.4.15 (previously 1.8.3) and replaces the files.ignore array with a files.includes array that uses ** plus negated glob patterns to exclude package.json, .turbo/, dist, and nix/store.

Changes

Biome Configuration Update

Layer / File(s)	Summary
Schema version and file filtering migration biome.json	$schema URL updated to 2.4.15; files.ignore replaced with files.includes using ** and negated globs (!package.json, !.turbo/, !dist, !nix/store) to achieve equivalent exclusions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇 A schema so fresh, a version so new,
The globs flip to includes with a ! or two,
No dist, no turbo, no nix in the stew,
The biome bunny hops to 2.4.15 — wahoo!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely summarizes the main change: migrating biome.json from 1.x to 2.x schema, which is the primary objective of the PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/biome-2-config

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