fix(functions): set per_worker as default request policy for functions serve (#4040)

feat(cli): set per_worker as default request policy for functions serve

Hot reload is now enabled by default when serving Edge Functions locally.
Users experiencing issues with auto-reload (e.g. large repos, symlinked paths,
or limited import resolution) can switch back to oneshot mode in config.toml.

Author: avallete

pkg/config/templates/config.toml

@@ -303,9 +303,10 @@ enabled = false
 
 [edge_runtime]
 enabled = true
-# Configure one of the supported request policies: `oneshot`, `per_worker`.
-# Use `oneshot` for hot reload, or `per_worker` for load testing.
-policy = "oneshot"
+# Supported request policies: `oneshot`, `per_worker`.
+# `per_worker` (default) — enables hot reload during local development.
+# `oneshot` — fallback mode if hot reload causes issues (e.g. in large repos or with symlinks).
+policy = "per_worker"
 # Port to attach the Chrome inspector for debugging edge functions.
 inspector_port = 8083
 # The Deno major version to use.