test: validate telemetry without content tags (ge-hch.3.2)

[SorraTheOrc]

Summary

• remove #choice_selected tags from demo story to test runtime telemetry emission without content tags
• validated telemetry via npm test (unit + Playwright) and validate-story CLI

Testing

• npm ci
• npm test
• node scripts/validate-story.js --story web/stories/demo.ink --output stdout --state-file /tmp/validate-state.json

Findings

• Playwright telemetry test still observes choice_selected events (waitForTelemetry succeeded)
• validate-story passes; story runs to completion without tags