docs: add developer-workflow.org and language examples

Complete workflow guide for Perl, Python, Go, Ansible, Terraform, Podman.
Includes working example files in examples/ directory.

examples/terraform/main.tf

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+# main.tf — Demonstrates core Terraform features for Doom Emacs workflow.
+#
+# Navigate: SPC s i (imenu), SPC s p (grep in project)
+# Format:   SPC m f (terraform fmt), Init: SPC m i, Plan: SPC m p
+#
+# Uses null_resource for a provider-free demo. Replace with real providers
+# (aws, azurerm, google) for actual infrastructure.
+
+terraform {
+  required_version = ">= 1.5"
+  required_providers {
+    null = {
+      source  = "hashicorp/null"
+      version = "~> 3.0"
+    }
+  }
+}
+
+# A null resource that runs a local command — useful for demos and provisioning
+resource "null_resource" "hello" {
+  triggers = {
+    message = var.greeting_message
+  }
+
+  provisioner "local-exec" {
+    command = "echo '${var.greeting_message}' > /tmp/terraform-hello.txt"
+  }
+}
+
+# Output the greeting message for verification
+output "greeting" {
+  description = "The greeting message written to file"
+  value       = var.greeting_message
+}
+
+output "environment" {
+  description = "Current deployment environment"
+  value       = var.environment
+}

examples/terraform/variables.tf

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+# variables.tf — Input variables for the Terraform demo.
+
+variable "greeting_message" {
+  description = "Message to write to the output file"
+  type        = string
+  default     = "Hello from Terraform!"
+}
+
+variable "environment" {
+  description = "Deployment environment name"
+  type        = string
+  default     = "dev"
+
+  validation {
+    condition     = contains(["dev", "staging", "prod"], var.environment)
+    error_message = "Environment must be dev, staging, or prod."
+  }
+}