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chore(deps): upgrade ESLint 8 → 10 (flat config) and chai 4 → 6 (#1934)

* chore(deps): upgrade ESLint 8 → 10 (flat config) and chai 4 → 6

Migrate ESLint to flat config format (eslint.config.mjs), remove
.eslintrc. Upgrade chai to v6 which includes built-in TypeScript
types, remove @types/chai.

- Replace eslint-plugin-import with eslint-plugin-import-x (ESLint 10 compatible fork)
- Add typescript-eslint unified package for flat config support
- Disable import-x/no-unused-modules (incompatible with ESLint 10)
- Add test file overrides for chai expressions and sinon namespace
- Remove --ext flag from eslint scripts (not supported in flat config)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: resolve CI issues for ESLint 10 + chai 6 upgrade

- Add .claude/** to ESLint ignores (worktree dirs were being linted)
- Remove unused eslint-disable directive in assets.ts (import-x/no-unresolved)
- Re-add @types/chai (chai 6 does not ship built-in types)
- Auto-fix prettier formatting in eslint.config.mjs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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