docs: add flip rules for native embed #114–#116 blockers

[enricopiovesan]

Summary

Stay-on-top hygiene for Phase 3 native embeds:

• Project 2 Note fields on Embed WASM runtime: Swift clients (iOS + macOS, traverse-starter + doc-approval) #114–Embed WASM runtime: Windows WinUI clients (traverse-starter + doc-approval) #116 with unblock criteria
• AGENTS.md Flip rules table so /app-refs-ops moves Blocked → Ready when Traverse closes:
  • Embed WASM runtime: Android Compose clients (traverse-starter + doc-approval) #115/Embed WASM runtime: Windows WinUI clients (traverse-starter + doc-approval) #116 ← #750 + #751
  • Embed WASM runtime: Swift clients (iOS + macOS, traverse-starter + doc-approval) #114 ← #750 + #751 + #647
• README What's Blocked points at the flip rules

No status change yet — upstream still open (#750 Blocked on baseline/#752; #751/#752 In Progress).

Governing Spec

• Board hygiene / AGENTS.md coordination

Project Item

• Issues: Embed WASM runtime: Swift clients (iOS + macOS, traverse-starter + doc-approval) #114, Embed WASM runtime: Android Compose clients (traverse-starter + doc-approval) #115, Embed WASM runtime: Windows WinUI clients (traverse-starter + doc-approval) #116 (hygiene only)

Definition of Done

• Flip rules documented
• Project Notes set
• Issue comments with flip rule

Validation

• Docs-only; Project 2 remains Blocked for Embed WASM runtime: Swift clients (iOS + macOS, traverse-starter + doc-approval) #114–Embed WASM runtime: Windows WinUI clients (traverse-starter + doc-approval) #116

Checklist

• Issue linked and Project 2 item updated
• Updated AGENTS.md platform / blocked summary if this changes platform status
• No business logic added to UI layer
• CI gates pass locally where applicable (docs-only)