refactor(runtime): harden channel-registry cache invalidation and split outbound delivery flow

src/media/parse.ts

@@ -79,6 +79,10 @@ function unwrapQuoted(value: string): string | undefined {
   return trimmed.slice(1, -1).trim();
 }
 
+function mayContainFenceMarkers(input: string): boolean {
+  return input.includes("```") || input.includes("~~~");
+}
+
 // Check if a character offset is inside any fenced code block
 function isInsideFence(fenceSpans: Array<{ start: number; end: number }>, offset: number): boolean {
   return fenceSpans.some((span) => offset >= span.start && offset < span.end);
@@ -106,7 +110,8 @@ export function splitMediaFromOutput(raw: string): {
   let foundMediaToken = false;
 
   // Parse fenced code blocks to avoid extracting MEDIA tokens from inside them
-  const fenceSpans = parseFenceSpans(trimmedRaw);
+  const hasFenceMarkers = mayContainFenceMarkers(trimmedRaw);
+  const fenceSpans = hasFenceMarkers ? parseFenceSpans(trimmedRaw) : [];
 
   // Collect tokens line by line so we can strip them cleanly.
   const lines = trimmedRaw.split("\n");
@@ -115,7 +120,7 @@ export function splitMediaFromOutput(raw: string): {
   let lineOffset = 0; // Track character offset for fence checking
   for (const line of lines) {
     // Skip MEDIA extraction if this line is inside a fenced code block
-    if (isInsideFence(fenceSpans, lineOffset)) {
+    if (hasFenceMarkers && isInsideFence(fenceSpans, lineOffset)) {
       keptLines.push(line);
       lineOffset += line.length + 1; // +1 for newline
       continue;