chore: initialize go-sip repository

.gitignore

@@ -0,0 +1,51 @@
+# Local build/runtime state
+/bin/
+/dist/
+/spool/
+/tmp/
+*.db
+*.db-shm
+*.db-wal
+*.log
+*.pid
+
+# Local credentials and operator overrides
+.env
+.env.*
+*.env
+!configs/example.env
+*.secret
+*.key
+*.pem
+*.crt
+.local/
+.pi/
+.codegraph/
+
+# Go/tool caches
+.coverage
+coverage.out
+*.coverprofile
+*.test
+*.prof
+/go.work
+/go.work.sum
+/vendor/
+
+# Captures and generated release archives
+*.pcap
+*.pcapng
+*.wav
+*.flac
+*.ogg
+*.opus
+*.tar
+*.tar.gz
+*.tar.bz2
+*.zip
+
+# OS/editor metadata
+.DS_Store
+
+# Temporary merge artifacts
+agents.md.pending_merge