fix: resolve memory leaks and zombie processes from missing cleanup handlers#13186

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dzianisv wants to merge 7 commits intoanomalyco:devfrom

dzianisv:fix/memory-leak-cleanup

Commits on Feb 13, 2026

fix: resolve memory leaks and zombie processes from missing cleanup handlers
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test: add integration tests for memory leak fixes
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fix: eliminate O(n²) string concatenation and throttle metadata updates
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fix: eliminate per-token O(n²) allocations in LLM streaming and PTY buffer
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fix: use readiness signal instead of sleep in SIGTERM test to avoid race condition
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fix: avoid disposeAll in test to prevent cross-test unhandled rejections
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fix: eliminate O(n²) string concatenation in ripgrep, copilot streaming, and webfetch
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