fix(stories): release longform readers on every exit

[rudycelekli]

Summary

The longform stream consumer can leave its response reader locked when an event callback throws or when rendering completes before the response closes. An abort can also leave a pending read waiting. The active renderer throws on render error events. Each exit should cancel unread data and release the reader lock.

Closes #2652.

Changes

• Cancel and release response readers on callback failures, completion and abort.
• Synchronize relevant documentation and add a quiet credited Unreleased changelog entry.
• No new UI strings or locale keys; maintained version files are unchanged.

Type

• 🐛 Bug fix
• ✨ New feature
• ♻️ Refactor
• 📝 Documentation
• 🧪 Tests
• 🔧 CI / Build
• 🚀 Release prep

Testing

• Hosted CI audit at 2026-10-06T12:35:20.584679+00:00: no failing latest checks; required CLA passes. All latest reported checks completed successfully. No upstream merge performed.

• Native Node Web Streams regressions: 3 failed and 5 passed before; all 8 pass after. No live backend/model rendering.

• git diff --check and the repository changelog style gate pass.

• Focused JavaScript tests used Node 24.19.0 and a reused Vitest 5.0.1 runtime; this repository pins Vitest 4.1.11. No full build qualification is claimed.

• Full backend suites and bun run check:electron were not run locally. The human CLA signature is registered and the required CLA status passes; hosted results are reported separately below.

Checklist

• I've tested this locally
• Every commit author has signed the CLA (the CLA check tells you how)
• I've updated relevant documentation (if applicable)
• No local machine paths, logs, or personal env details in this PR
• Maintained version files are in sync (if an owner-requested bump): root package.json, pyproject.toml, backend/core/version.py, and lockfiles
• If this PR changes runtime behavior, the regression fixture at tests/fixtures/omnivoice_data/ still loads green on the smoke-matrix CI job (macOS + Windows + Linux)

Release cadence

VoiceStudio ships continuous-to-main — no release candidates, no soak windows.
Every merged PR is immediately part of rolling source (main) and Docker
:latest. Electron artifact rehearsals validate desktop packages without publishing.
Version bumps require owner approval; validated releases are tagged from main
and published explicitly under the release checklist.
Users who want stability install an Electron release or pin Docker :stable.

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📥 Commits

Reviewing files that changed from the base of the PR and between 286f46b and 7921a80.

📒 Files selected for processing (4)

• CHANGELOG.md
• docs/expressive-speech.md
• electron/src/shared/test/longformStream.test.js
• electron/src/shared/utils/longformStream.js

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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[greptile-apps]

[Medium risk] Fixes stream cleanup when reading longform content stops.

No merge-blocking issue was established in the changed code.

Summary

The PR adds cancellation and reader-lock cleanup to the shared longform stream consumer on completion, callback failure, and abort. It adds native-stream regression tests and updates the changelog and streaming documentation.

_{Reviews (1) · Last reviewed commit: "fix(stories): release longform readers o..."}

[github-actions]

All contributors on this pull request have signed the VoiceStudio CLA. Thank you!

[rudycelekli]

recheck