Exclude local credentials, private data, and generated artifacts

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

.gitignore

@@ -0,0 +1,39 @@
+### Go ###
+# Binaries for programs and plugins
+bin/
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+### Go Patch ###
+/vendor/
+/Godeps/
+
+# IDE files
+.vscode
+.idea
+
+# Local credentials, cookies, and agent metadata
+.env
+.env.*
+!.env.example
+cookies.*
+*.pem
+*.key
+*.session*
+*.db*
+*.log
+.agents/
+.codex/
+.claude/