Fixed

• Zombie process leak: PTY reader now reaps child process on exit

• Screenshot goroutine data race eliminated with channel pattern

• Incorrect double-width rendering for U+2600-U+27BF symbol range removed

• pprof server gracefully skips when port is in use

• resizeBuf no longer falsely clears wide chars on grid grow

• VT parser: stateIgnore byte drop, C1 control handling, stale CSI params

• DECOM origin mode scroll region, DECRC/RCP cursor clamp, ECH wide char overlap

• Primary scroll region preserved across alt screen toggle (no longer lost after TUI exit)

• Alt screen wrapped slice deep-copied instead of aliased

• Gray background on window resize (missing screenDirty flag)

• GPU image leak on resize — old offscreen/blocksLayer/modalLayer now deallocated

• Pane cache leak on tab close — closed pane references now released

• Config reload rollback on failed font load prevents inconsistent state