docs: record C1 state-machine completion bar decision

[enricopiovesan]

Summary

• Append decision-log entry: Spec 001/002 web kit author proof bar (C1) is Done after starter-web: live Spec 001 presentation from subscribe #298–web: port live Spec 001 presentation to primary shells #300.
• Explicitly defer C2 (visible flash), C3 (live blocked/ended), C4 (native parity).

Governing Spec

• Specs 001 / 002 (documentation only; no code change)

Project Item

• Docs hygiene follow-up to starter-web-live-presentation-subscribe, web-session-presentation-shared, web-session-presentation-port-primary (all Done)

Definition of Done

• Decision log entry on main via PR
• No code/runtime changes

Validation

# docs-only
git log -1 --oneline -- docs/decision-log.md

Made with Cursor