fix: remove abort listener after fetch completion

[koriyoshi2041]

Summary

• remove the caller signal abort listener when fetchWithTimeout completes
• add a regression test that verifies the listener is removed after a successful fetch

Fixes #1811.

Tests

• ./node_modules/.bin/jest tests/index.test.ts -t "removes abort listener after successful fetch" --runInBand
• ./node_modules/.bin/prettier --check src/client.ts tests/index.test.ts
• ./node_modules/.bin/eslint src/client.ts tests/index.test.ts

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[chatgpt-codex-connector]

Keep the abort listener until streams finish

For streaming requests (options.stream), fetch resolves as soon as response headers arrive, while the body is consumed later by Stream.fromSSEResponse(response, props.controller, ...) in src/internal/parse.ts. Removing the caller's abort listener in this finally means an external AbortController only cancels up to header receipt; aborting after the stream is returned no longer propagates to the controller that _iterSSEMessages uses to stop the body read, so long-running streams cannot be cancelled via the original request signal.

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[koriyoshi2041]

Thanks, good catch. I updated the PR so streaming requests keep the caller abort listener after fetch resolves, which preserves external abort propagation to the stream controller after headers are received.

Added a regression test for the streaming case and reran:

• ./node_modules/.bin/jest tests/index.test.ts -t 'abort listener' --runInBand

• ./node_modules/.bin/prettier --check src/client.ts tests/index.test.ts

• ./node_modules/.bin/eslint src/client.ts tests/index.test.ts

• git diff --check