fix(mcp): line-anchor conflict scan and worktree scan paths (#272)

Match git conflict markers on whole lines only so decorative equals
borders in mcp_discoverability.py no longer false-positive. Scan
session worktrees under branches/ without skipping the entire tree
when the worktree path contains "branches".

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

mcp_server.py

@@ -6,26 +6,24 @@ Runs over stdio. All tools authenticate via macOS keychain (git credential fill)
 import os
 import sys
 
+from role_session_router import (
+    python_bytes_have_conflict_markers,
+    skip_python_scan_walk_root,
+)
+
+
 # Startup health check: scan all python files in the Gitea-Tools directory for unresolved conflict markers.
 def check_conflict_markers():
     dir_path = os.path.dirname(os.path.abspath(__file__))
-    # Construct conflict patterns dynamically so the loader does not match itself
-    conflict_patterns = [
-        b"<" * 7 + b" ",
-        b"=" * 7 + b"\n",
-        b"=" * 7 + b"\r\n",
-        b">" * 7 + b" "
-    ]
     for root, dirs, files in os.walk(dir_path):
-        if any(p in root for p in ("venv", ".git", ".pytest_cache", "branches")):
+        if skip_python_scan_walk_root(dir_path, root):
             continue
         for file in files:
             if file.endswith(".py"):
                 file_path = os.path.join(root, file)
                 try:
                     with open(file_path, "rb") as f:
-                        content = f.read()
-                        if any(pattern in content for pattern in conflict_patterns):
+                        if python_bytes_have_conflict_markers(f.read()):
                             rel_path = os.path.relpath(file_path, dir_path)
                             print(
                                 f"infra_stop: Unresolved merge conflict detected in {rel_path}. "