added hard line breaks support

examples.md

@@ -12,6 +12,7 @@ Root directory manifest (`.wp-materialize.json`):
   "tags": { "content": ["automation", "wordpress"], "inherit": true },
   "author": { "content": ["editorial"], "inherit": true },
   "renderer": "pandoc",
+  "hard_line_breaks": true,
   "subdirectories": { "content": ["design", "notes"], "inherit": true },
   "files": {
     "post.md": {
@@ -22,6 +23,7 @@ Root directory manifest (`.wp-materialize.json`):
     "essay.md": {
       "use_heading_as_title": { "level": 1, "strict": true },
       "renderer": "py-gfm",
+      "hard_line_breaks": false,
       "created_on": "2025-01-10 09:30",
       "last_modified": "2025-02-14 16:45"
     }
@@ -51,6 +53,7 @@ Subdirectory manifest (`design/.wp-materialize.json`):
   "wordpress_root": "/var/www/wordpress",
   "repo_storage_dir": "/home/user/wp-materialize-repos",
   "renderer": "default",
+  "hard_line_breaks": false,
   "git_repositories": [],
   "directories": [
     {
@@ -69,6 +72,7 @@ Subdirectory manifest (`design/.wp-materialize.json`):
   "wordpress_root": "/var/www/wordpress",
   "repo_storage_dir": "/home/user/wp-materialize-repos",
   "renderer": "default",
+  "hard_line_breaks": false,
   "git_repositories": [
     {
       "name": "content-repo",
@@ -100,6 +104,7 @@ Subdirectory manifest (`design/.wp-materialize.json`):
   "wordpress_root": "/var/www/wordpress",
   "repo_storage_dir": "/home/user/wp-materialize-repos",
   "renderer": "default",
+  "hard_line_breaks": false,
   "git_repositories": [
     {
       "name": "content-repo",