chore(examples): remove unused and lint-only dependencies (#234)

* chore(examples/twd-test-app): remove unused and lint-only deps

Removes:
- chai, @types/chai (not imported anywhere; chai is consumed
  internally by twd-js, examples don't need a direct dep)
- eslint, @eslint/js, eslint-plugin-react-hooks,
  eslint-plugin-react-refresh, globals, typescript-eslint
  (linting is intentionally not enforced in examples per
  feat/linter-husky design)

Also deletes eslint.config.js and the "lint" npm script.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* chore(examples/tutorial-example): remove unused and lint-only deps

Removes truly unused (no imports anywhere):
- @cypress/code-coverage (leftover from a Cypress migration)
- @radix-ui/react-avatar
- @testing-library/jest-dom
- @testing-library/react
- babel-plugin-istanbul (no Babel config exists)
- jsdom
- vitest (no vitest config; tests use TWD's runner)

Removes lint-only:
- eslint, @eslint/js, eslint-plugin-react-hooks,
  eslint-plugin-react-refresh, globals, typescript-eslint
  (linting is intentionally not enforced in examples per
  feat/linter-husky design)

Also deletes eslint.config.js, the "lint" npm script, and
the broken "test" script (it called vitest but no setup).

Drops total deps from 43 to 30.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: kevinccbsg