feat: add Roku WebDriver provider

[thymikee]

Summary

Add a Roku WebDriver provider for LAN Roku devices.

• Adds connect roku profile support with --roku-webdriver-url and --roku-device-ip, plus web-instance lease backend plumbing.
• Implements Roku WebDriver session allocation, launch, source snapshots, ECP TV remote input, close/release cleanup, and conservative web-TV capability gating.
• Covers CLI/profile parsing, capability gating, and a provider-scenario daemon flow using a fake Roku WebDriver/ECP server.

Validation

• pnpm format
• pnpm exec vitest run src/cli/parser/__tests__ src/utils/__tests__/command-schema-guards.test.ts src/__tests__/cloud-connect-profile.test.ts src/__tests__/remote-connection.test.ts src/core/__tests__/capabilities.test.ts src/core/__tests__/capability-plugin-routing-parity.test.ts test/integration/provider-scenarios/roku-webdriver-runtime.test.ts
• pnpm typecheck
• pnpm build
• pnpm test:smoke
• pnpm check:unit unit projects passed once; a rerun hit an unrelated Apple runner slow-test timeout under host load, and the timed-out tests passed in isolation with pnpm exec vitest run src/platforms/apple/core/__tests__/runner-client.test.ts src/platforms/apple/core/__tests__/index.test.ts --testNamePattern "ensureXctestrun rebuilds after cached macOS runner repair failure|screenshotIos retries simulator capture timeouts and eventually succeeds"

[github-actions]

Size Report

Metric	Base	Current	Diff
JS raw	1.6 MB	1.6 MB	+9.5 kB
JS gzip	508.2 kB	510.2 kB	+2.0 kB
npm tarball	610.6 kB	612.7 kB	+2.1 kB
npm unpacked	2.2 MB	2.2 MB	+9.6 kB

Startup median (7 runs, lower is better):

Scenario	Base	Current	Diff
CLI --version	28.5 ms	28.2 ms	-0.3 ms
CLI --help	57.2 ms	55.1 ms	-2.0 ms

Top changed chunks:

Chunk	Raw diff	Gzip diff
dist/src/logcat.js	+16.3 kB	+5.8 kB
dist/src/internal/daemon.js	+8.4 kB	+1.7 kB
dist/src/cli-help.js	+667 B	+197 B
dist/src/cli.js	+730 B	+183 B
dist/src/registry.js	+487 B	+173 B