fix: render synchronized output atomically

[Railly]

Summary

• track DEC private mode ?2026 in the built-in core
• suppress scheduled paints while synchronized output is active
• render once when synchronized output ends

Testing

• zig build test
• pnpm --filter @wterm/core test
• pnpm --filter @wterm/dom test
• core and DOM type checks

Fixes #57

[vercel]

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Project	Deployment	Actions	Updated (UTC)
wterm	Ready	Preview	Aug 8, 2026 11:35pm