Ignore build/test output and workspace runtime state

Add .gitignore rules for SQLite WAL/SHM sidecars, coverage output, and
the dev workspace/data storage dir (keeping the demo.xml/epics_test.xml
fixtures), completing the runtime-artifact cleanup.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -12,3 +12,16 @@ resources
 .iocsh_history
 go.work.sum
 *.log
+
+# Test output
+coverage.out
+*.coverprofile
+
+# SQLite runtime databases (sidecar WAL/SHM)
+*.db-shm
+*.db-wal
+
+# uopi dev runtime storage — ignore generated state, keep curated fixtures
+workspace/data/*
+!workspace/data/demo.xml
+!workspace/data/epics_test.xml