feat: Add air configuration

.air.toml

@@ -0,0 +1,31 @@
+root = "."
+tmp_dir = "tmp"
+
+[build]
+  full_bin = "./dist/synthetic-monitoring-agent --debug --api-server-address=localhost:4031 --api-insecure=true --dev=true"
+  cmd = "make build"
+  delay = 1000
+  exclude_dir = [".chglog", ".github"]
+  exclude_file = []
+  exclude_regex = []
+  exclude_unchanged = false
+  follow_symlink = false
+  include_dir = []
+  include_ext = ["go"]
+  kill_delay = "0s"
+  log = "build-errors.log"
+  send_interrupt = true
+  stop_on_error = true
+
+[color]
+  app = ""
+  build = "yellow"
+  main = "magenta"
+  runner = "green"
+  watcher = "cyan"
+
+[log]
+  time = false
+
+[misc]
+  clean_on_exit = false

.gitignore

@@ -87,3 +87,6 @@ tags
 
 # Local dev environment configuration files
 *.env
+
+# Files generated by air
+tmp

DEVELOPMENT.md

@@ -23,6 +23,17 @@ The documentation for other targets is available thru:
 $ make help
 ```
 
+Livereload Development
+----------------------
+
+Install [air](https://github.com/air-verse/air?tab=readme-ov-file#installation) and ensure `SM_AGENT_API_TOKEN` is set prior to running.
+
+```
+$ air
+```
+
+Any code changes will now trigger air to rebuild the agent and run the generated executable.
+
 Linting
 -------