Add tests, templates, and Gitea Actions workflows

.templates/default/.env.template

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+# Environment template for agent workspaces
+
+# Agent identification
+AGENT_ID={agentName}
+WORKSPACE_PATH={workspacePath}
+AGENT_WORKSPACE={workspacePath}
+
+# Git user configuration (set by git-agent-sync)
+GIT_USER_NAME={gitUserName}
+GIT_USER_EMAIL={gitUserEmail}
+
+# Agent metadata
+AGENT_CREATED_AT={createdAt}
+
+# Custom environment variables can be added below
+# Example:
+# API_KEY=your-api-key
+# DEBUG=true