SubMiner/backlog/tasks/task-143 - Keep-character-dictionary-auto-sync-non-blocking-during-startup.md

id, title, status, assignee, created_date, updated_date, labels, dependencies, references, priority, ordinal

id	title	status	assignee	created_date	updated_date	labels	dependencies	references	priority	ordinal
TASK-143	Keep character dictionary auto-sync non-blocking during startup	Done		2026-03-09 01:45	2026-03-16 05:13	dictionary startup performance		/home/sudacode/projects/japanese/SubMiner/src/main.ts /home/sudacode/projects/japanese/SubMiner/src/main/runtime/character-dictionary-auto-sync.ts /home/sudacode/projects/japanese/SubMiner/src/main/runtime/current-media-tokenization-gate.ts	high	37500

Description

Keep character dictionary auto-sync running in parallel during startup without delaying playback. Only tokenization readiness should gate playback; character dictionary import/settings updates should wait until tokenization is already ready and then refresh annotations afterward.

Acceptance Criteria

• #1 Character dictionary snapshot/build work can run immediately during startup.
• #2 Yomitan dictionary mutation work waits until current-media tokenization is ready.
• #3 Regression coverage verifies auto-sync builds before the gate and only mutates Yomitan after the gate resolves.

Implementation Notes

Added a small current-media tokenization gate in main runtime. Media changes reset the gate, the first tokenization-ready event marks it ready, and auto-sync now waits on that gate only before Yomitan dictionary inspection/import/settings updates. Snapshot generation and merged ZIP build still run immediately in parallel.