fix(core): reset flushEpoch on render error so renderer retries instead of freezing

[atul-upadhyay-7]

When _flush() throws before swap() completes, the epoch never advances, so flushEpoch stays equal to the current epoch and all future flushes are silently skipped — the UI freezes permanently.

Fix: Reset flushEpoch to -1 in the catch handler so the next frame tick retries rendering instead of short-circuiting.

Also fixes dev-server sending SIGTERM instead of SIGINT to the child process, which could prevent terminal cleanup handlers from running before exit.

• Closes [bug] Renderer._flush() exception permanently freezes all future rendering #2152
• Closes [bug] Dev-server SIGTERM kills child mid-restore; init error leaves terminal in raw mode with no signal handlers #2153

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📒 Files selected for processing (4)

• packages/core/src/terminal/Renderer.test.ts
• packages/core/src/terminal/Renderer.ts
• packages/store/src/store.test.ts
• packages/store/src/store.ts

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[github-actions]

Hi @atul-upadhyay-7 👋

⭐ Star this repo before your PR merges.

Why? GSSoC 2026 contributors who star get priority review and points credit. After you star, push any commit (or re-run this check). The needs-star label lifts automatically.

Thanks for your contribution to TermUI.

[github-actions]

Hi @atul-upadhyay-7 👋

⭐ Star this repo before your PR merges.

Why? GSSoC 2026 contributors who star get priority review and points credit. After you star, push any commit (or re-run this check). The needs-star label lifts automatically.

Thanks for your contribution to TermUI.

[Karanjot786]

Removed unrelated changes from this branch to keep the diff focused:

• packages/store/src/store.ts + store.test.ts — reverted to match main; this duplicated the commit/rollback-closure fix already merged in fix(store): update commit/rollback closure when setState updates existing batch entry #2151.
• packages/dev-server/src/server.ts (+ its test) — reverted the unrelated SIGTERM→SIGINT signal change to match main.

Kept: the Renderer.ts _flush() fix that resets flushEpoch = -1 on render error so the renderer retries instead of freezing, plus its test. Verified packages/core builds and Renderer.test.ts passes (18/18).