fix(correlation/bug3): emit pending orphans on B TTL expiry (v1.1.15)

cleanNetworkBufferByTTL was deleting pendingOrphans without emitting them,
causing silent data loss when a B event (network connection) expired while
A events were still waiting in the 500ms orphan delay buffer.

Fix: cleanNetworkBufferByTTL now returns []CorrelatedLog for forced orphans;
cleanExpired propagates them; ProcessEvent includes them in returned results.

TestBTTLExpiry_PurgesPendingOrphans extended to assert the orphan is actually
returned in ProcessEvent results (not just removed from internal state).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Makefile

@@ -20,7 +20,7 @@ BINARY_NAME=logcorrelator
 DIST_DIR=dist
 
 # Package version
-PKG_VERSION ?= 1.1.14
+PKG_VERSION ?= 1.1.15
 
 # Enable BuildKit for better performance
 export DOCKER_BUILDKIT=1