chore(deps): biome 2.5.5 + ultracite 7.9.4 migration

[tnunamak]

Upgrades @biomejs/biome 2.4.12 → 2.5.5 and ultracite 7.6.0 → 7.9.4, and clears every resulting lint violation. Resolves the biome/ultracite portion of Dependabot #22.

Scope

• Formatter reflow (biome 2.5 changed formatter defaults) — the bulk of the diff, mechanical.
• Config scoping — ultracite 7.9.4 broadened files.includes to **; restored the repo's TypeScript-only lint boundary, excluded design-system exploration prototypes (docs/design-system/**, unshipped .jsx/.html mockups), and waived noUnresolvedImports for valid package subpath exports biome cannot resolve.
• Rule fixes across ~600 sites: useDestructuring, noJsxPropsBind (→ useCallback or scoped ignore for non-memoized), noUnnecessaryConditions (removed dead, kept runtime guards), noAwaitInLoops (Promise.all only where independent, else scoped ignore), useErrorCause, useAwait, noShadow, and more.

Verification

• biome check: 0 errors, 0 warnings.
• Typechecks: reference-implementation + apps/console, clean.
• Test oracle: 7,182 reference-implementation tests pass, 0 fail.
• Independent behavioral probe (random-sampled 12 changed files + all noAwaitInLoops conversions + every biome-ignore): all transforms confirmed behavior-preserving; no dependent-loop parallelization; all suppressions legitimate. 54 dead/templated suppressions removed so the tree is genuinely clean.

Large diff, but ~99% formatter reflow. For maintainer review.

Closes #30.

[tnunamak]

Closing — this branch bumped biome/ultracite at ROOT only, which fails: the monorepo needs a UNIFORM version across all workspaces (mixed 2.5.5-root/2.4-workspace fails biome config-parsing under --frozen-lockfile).

Superseded by a properly-scoped uniform migration: biome 2.5.5 + ultracite 7.9.4 across ALL 7 workspaces, migrating legacy .js→.ts (not excluding), excluding only genuine artifacts via verified !!-negation configs, done in per-workspace reviewable tranches with reference-implementation last behind its behavioral suite. Grounded in official ultracite/biome docs. Will open as fresh per-workspace PRs.