Release Captail 0.1.2 performance and stability update

[FaulMit]

Summary

• move libobs lifecycle work to a dedicated serialized worker so settings, audio changes, replay toggles, saves, recovery, and shutdown do not block the WPF UI
• add transactional settings rollback, atomic configuration backups, graceful installer upgrades, and more reliable autostart migration
• remove the unnecessary single-source OBS scene composition pass and use the selected game client size for Game Capture
• harden native loading, OBS/runtime downloads, NuGet dependency locking, installer acquisition, and GitHub Actions
• add capability, codec, fault-recovery, and high-FPS Game Capture diagnostics
• prepare version 0.1.2 and document changes in English

Root cause

Captail previously performed thread-affine libobs startup and shutdown work from UI-triggered paths without one shared operation gate. Concurrent saves, setting changes, watchdog recovery, and application shutdown could contend, freeze the window, or leave partially applied state. Game Capture also passed its only source through an avoidable scene-composition stage.

Validation

• Release build: 0 warnings, 0 errors
• critical .NET analyzer rules: passed
• GPU capability model: passed
• hardware codec QA: AV1, HEVC, and H.264 passed
• fault recovery QA: three consecutive pipeline restarts and replay save passed
• 2560x1440 AV1 Game Capture at 240 FPS: 965 decoded frames, 965 unique frames, 0 adjacent duplicates, effective 240 unique FPS
• stressed capture: 0/1440 steady-state render lag; 1/2468 total encoding lag (0.0%)
• portable 0.1.2 package: checksum, version metadata, required OBS/native files, and UI launch passed
• NuGet vulnerability audit: no known vulnerable direct or transitive packages
• EN/RU localization parity: 197/197 keys
• GitHub workflow YAML and pinned action revisions verified

The GitHub release workflow will independently build and validate both Portable ZIP and Setup EXE, including silent install and uninstall tests.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Create the plugin data parent before copying

When the first listed OBS plugin has a data directory, this copies it to data\obs-plugins\<plugin> even though only $dataDestination was created above; the intermediate data\obs-plugins parent is still missing, so Copy-Item fails before CI/release can finish acquiring the OBS runtime. Create the obs-plugins data directory first or copy into an existing parent directory.

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[chatgpt-codex-connector]

Return the shutdown failure to the installer

In the existing-instance --shutdown-existing path, a timeout is stored here, but AcquireSingleInstance still returns false; the caller immediately takes the !AcquireSingleInstance branch and exits with plain Shutdown() before reaching the later nonzero exit-code logic. That makes the installer see success even when the running Captail instance never released the mutex, so updates can proceed while the old process is still holding files open.

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