Fix loop re-processing, branch awareness, and commit message clarity

- Sanitize AI responses by replacing BLIGHT: with BLIGHT: to prevent
  the service's own commits from triggering another processing cycle
- Pass branch (extracted from refs/heads/<branch>) through to Gitea get/update
  calls so pushes to non-default branches are read and written correctly
- Commit message now includes the file path: "BLIGHT: process triggers in <path>"

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

processor.py

@@ -12,6 +12,9 @@ DOCUMENT_PATTERN = re.compile(r"^BLIGHT::\s+(.+)$", re.MULTILINE | re.IGNORECASE
 
 FAILED_TEMPLATE = "<!-- BLIGHT_FAILED: {instruction} -->\n<!-- BLIGHT_ERROR: {error} -->"
 
+# Matches any BLIGHT: trigger in AI output that could cause a processing loop.
+_SANITIZE_PATTERN = re.compile(r"BLIGHT:", re.IGNORECASE)
+
 _MAX_RETRIES = 3
 _RETRY_DELAYS = [1, 2, 4]  # seconds between attempts
 
@@ -94,8 +97,8 @@ def _call_with_retry(document: str, instruction: str, *, document_scope: bool) -
     for attempt in range(_MAX_RETRIES):
         try:
             if document_scope:
-                return _provider.complete_document(document, instruction)
-            return _provider.complete(document, instruction)
+                return _sanitize(_provider.complete_document(document, instruction))
+            return _sanitize(_provider.complete(document, instruction))
         except Exception as exc:
             last_error = exc
             if attempt < _MAX_RETRIES - 1:
@@ -117,3 +120,8 @@ def _call_with_retry(document: str, instruction: str, *, document_scope: bool) -
         last_error,
     )
     return FAILED_TEMPLATE.format(instruction=instruction, error=last_error)
+
+
+def _sanitize(text: str) -> str:
+    """Defuse any BLIGHT: trigger patterns in AI output to prevent loop re-processing."""
+    return _SANITIZE_PATTERN.sub("BLIGHT&#58;", text)