[saseungmin]

Summary

Add typewriter() to reveal text one token at a time while preserving the completed layout. It reuses nativeText(), splitters, timelines, motion, controls, and external progress, and composes with fade/transform effects without another playback owner or per-character React updates.

• Add native-text capability/type/runtime gates and keep private visibility metadata out of public declarations.
• Preserve decomposed and mixed precomposed Hangul syllable clusters, plus original UTF-16 offsets, in the fallback grapheme splitter.
• Add Typewriter demos and matched renderer comparison cases, synchronize the four English/Korean READMEs, and cover visibility, Unicode, controls, progress, accessibility, and playback identity.

Validation

• Jest: 15 suites / 226 tests passed.
• Lint, format check, package/example typecheck, package build, and declaration audit passed.
• Independent code review found no confirmed defects; architecture review retained performance-validation watch items.
• Isolated iOS 26.4 simulator: initial playback, five key-remount replays, reset/play, long text, and background return checked.
• Android 16/API 36 release APK (debuggable=false, Hermes): 62 native assertions / 13 snapshots passed.
• Android release profiling: 40 measured runs / 2,953 rendered frame samples across two full sessions; separate Perfetto validation uniquely matched 108/108 measured frame IDs.

Behavior and validation limits

• External progress remains timeline progress, rather than a percentage of visible characters; decreasing it can hide tokens again. Existing stop/play semantics remain unchanged.
• Android emulator pooled frame p95 was approximately 19 ms for matched 54-character fade/Typewriter cases and 34 ms for 130-character Typewriter stress. CPU differences varied between sessions, and occasional long frames were observed; these results do not establish universal performance suitability.
• Physical-device and iOS release performance remain unverified. A prior rendering anomaly on a shared iOS simulator was not reproduced on the isolated simulator; its cause is unresolved.
• Cursor/streaming and complete Unicode grapheme conformance remain outside this change.

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Latest commit: fa1d5d8

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-27T12:45:25.066529Z	fa1d5d8	PR opened

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