chore(ci): bump biome schema version to 2.5.2

[fro-bot]

Summary

Bumps the biome.json "" reference from 2.5.1 to 2.5.2 to match the installed @biomejs/biome@2.5.2 CLI. bun run lint previously reported:

i The configuration schema version does not match the CLI version 2.5.2
  Expected: 2.5.2
  Found:    2.5.1

After this change bun run lint is clean (63 files, no info).

Verification

Check	Result
bun install	clean
bun run lint	clean (63 files)
bun run typecheck	clean
bun run build	clean

Changeset

Config/lint-only change; no user-visible changes; no changeset needed.

[fro-bot]

Autoheal run summary for schedule #28712348494 (2026-07-04).

Run Summary

• ERRORED PRs: 3 open PRs (fix(deps): update dependency @opentui/core to v0.2.7 #130, fix(deps): update dependency @opentui/solid to v0.2.8 #135, chore(dev): update @types/node 24 → 26 (major) #241) — all CI green; no fixes required.
• SECURITY: 0 open Dependabot alerts; no security PRs needed.
• HEALTH & MAINTENANCE: Peer dep @opencode-ai/plugin >=1.14.41 valid vs latest 1.17.13. All workflow actions SHA-pinned. @types/node 24→26 tracked by chore(dev): update @types/node 24 → 26 (major) #241 (left as-is). No changeset drift. No new major devDep bumps.
• DEVELOPER EXPERIENCE: bun install / typecheck / build clean on main. bun run lint reported a biome `` mismatch (2.5.1 vs CLI 2.5.2) — fixed by this PR (schema bumped to 2.5.2). main is protected, so the fix is delivered via this branch/PR. CI on this PR is green; lint now clean.

Perpetual issue #26 updated with the 2026-07-04 section prepended.

Bot: Fro Bot (schedule autoheal)