chore: change copilot default version to latest (#499)

## Description

Changes `copilot_version` default to `latest`

## Type of Change

- [ ] New module
- [ ] New template
- [X] Bug fix
- [ ] Feature/enhancement
- [ ] Documentation
- [ ] Other

## Module Information

<!-- Delete this section if not applicable -->

**Path:** `registry/coder-labs/modules/copilot`  
**New version:** `v0.2.2`  
**Breaking change:** [ ] Yes [X] No

## Testing & Validation

- [X] Tests pass (`bun test`)
- [X] Code formatted (`bun fmt`)
- [X] Changes tested locally

## Related Issues

<!-- Link related issues or write "None" if not applicable -->

registry/coder-labs/modules/copilot/README.md

@@ -13,7 +13,7 @@ Run [GitHub Copilot CLI](https://docs.github.com/copilot/concepts/agents/about-c
 ```tf
 module "copilot" {
   source   = "registry.coder.com/coder-labs/copilot/coder"
-  version  = "0.2.1"
+  version  = "0.2.2"
   agent_id = coder_agent.example.id
   workdir  = "/home/coder/projects"
 }
@@ -51,7 +51,7 @@ data "coder_parameter" "ai_prompt" {
 
 module "copilot" {
   source   = "registry.coder.com/coder-labs/copilot/coder"
-  version  = "0.2.1"
+  version  = "0.2.2"
   agent_id = coder_agent.example.id
   workdir  = "/home/coder/projects"
 
@@ -71,12 +71,12 @@ Customize tool permissions, MCP servers, and Copilot settings:
 ```tf
 module "copilot" {
   source   = "registry.coder.com/coder-labs/copilot/coder"
-  version  = "0.2.1"
+  version  = "0.2.2"
   agent_id = coder_agent.example.id
   workdir  = "/home/coder/projects"
 
-  # Version pinning (defaults to "0.0.334", use "latest" for newest version)
-  copilot_version = "latest"
+  # Version pinning (defaults to "latest", use specific version if desired)
+  copilot_version = "0.0.334"
 
   # Tool permissions
   allow_tools         = ["shell(git)", "shell(npm)", "write"]
@@ -142,7 +142,7 @@ variable "github_token" {
 
 module "copilot" {
   source       = "registry.coder.com/coder-labs/copilot/coder"
-  version      = "0.2.1"
+  version      = "0.2.2"
   agent_id     = coder_agent.example.id
   workdir      = "/home/coder/projects"
   github_token = var.github_token
@@ -156,7 +156,7 @@ Run Copilot as a command-line tool without task reporting or web interface. This
 ```tf
 module "copilot" {
   source       = "registry.coder.com/coder-labs/copilot/coder"
-  version      = "0.2.1"
+  version      = "0.2.2"
   agent_id     = coder_agent.example.id
   workdir      = "/home/coder"
   report_tasks = false

registry/coder-labs/modules/copilot/main.tf

@@ -104,7 +104,7 @@ variable "agentapi_version" {
 variable "copilot_version" {
   type        = string
   description = "The version of GitHub Copilot CLI to install. Use 'latest' for the latest version or specify a version like '0.0.334'."
-  default     = "0.0.334"
+  default     = "latest"
 }
 
 variable "report_tasks" {