fix: 1181 fix colorspace changes when session clear and fix memory leak with orphaned sessions#1182

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mcoliver wants to merge 2 commits intoAcademySoftwareFoundation:mainfrom

mcoliver:1181-fix-colorspace-changes-when-session-clear

Commits on Mar 4, 2026

Move hardware device context unreferencing from destructor to conditional frame cleanup.
mcoliver
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feat: Add `afterClearSession` event handlers to `source_setup` and `ocio_source_setup` plugins to reset internal states after session clear.
mcoliver
committed