revert: Restore conditional the_content filter usage

- Reverted nuclear option from v0.4.8
- get_post_data() now uses the_content filter conditionally
- All other protections remain in place
- Memory leak investigation to be continued later

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

includes/Frontend/TemplateLoader.php

@@ -289,18 +289,34 @@ class TemplateLoader {
         // Track recursion to prevent infinite loops from shortcodes in content.
         ++self::$recursion_depth;
 
-        // ALWAYS skip the_content filter to prevent any possible recursion.
-        // FediStream posts don't need shortcode processing in their content.
-        // This is the nuclear option but it guarantees no recursion.
-        $excerpt = $post->post_excerpt;
-        if ( empty( $excerpt ) ) {
-            // Generate a simple excerpt without triggering the_content filter.
-            $excerpt = wp_trim_words( wp_strip_all_tags( $post->post_content ), 55, '…' );
+        // Skip the_content filter if:
+        // 1. We're in a shortcode context (prevents recursive shortcode processing)
+        // 2. We're at depth > 1 (nested data loading)
+        // 3. We're loading a page template
+        $skip_content_filter = self::$shortcode_context_depth > 0
+            || self::$recursion_depth > 1
+            || self::$loading_page_template;
+
+        // When skipping content filter, use raw excerpt to avoid get_the_excerpt()
+        // triggering the_content filter internally when generating auto-excerpts.
+        if ( $skip_content_filter ) {
+            $excerpt = $post->post_excerpt;
+            if ( empty( $excerpt ) ) {
+                // Generate a simple excerpt without triggering the_content filter.
+                $excerpt = wp_trim_words( wp_strip_all_tags( $post->post_content ), 55, '…' );
+            }
+        } else {
+            $excerpt = get_the_excerpt( $post );
         }
 
-        // Strip shortcodes and sanitize content - never apply the_content filter.
-        $content = strip_shortcodes( $post->post_content );
-        $content = wp_kses_post( $content );
+        // When skipping content filter, strip shortcodes to prevent them from
+        // being processed by anything else that might call do_shortcode on the output.
+        if ( $skip_content_filter ) {
+            $content = strip_shortcodes( $post->post_content );
+            $content = wp_kses_post( $content );
+        } else {
+            $content = apply_filters( 'the_content', $post->post_content );
+        }
 
         $data = array(
             'id'        => $post->ID,