chore: Upgrade Harness to 1.5.0

[mrousavy]

Upgrade all five direct Harness dependencies from 1.3.0 to 1.5.0 and regenerate the Bun lockfile.

After reviewing the intervening release notes, remove the deprecated unstable__skipAlreadyIncludedModules: false override to use the faster default. Replace the manual skipOnWeb() helper and early returns with Harness’s context.skip(condition, reason): the 26 unsupported web tests now appear as skipped instead of passed.

The browser runner still requires the existing web server/proxy. There are no Harness dependency patches to remove.

Validation:

• Frozen-lockfile install and library build passed.
• Library and example TypeScript checks passed.
• ESLint and Prettier checks passed in both workspaces; the Harness config also passes Prettier.
• Unit tests: 6 passed.
• Chromium Harness suite: 50 passed, 26 skipped, 76 total, using the faster module-loading default.
• iOS and Android Harness suites will run in PR CI; they were not run locally.