fix: resolve conflicts for PR #490

Merge prgs/master; unify preflight read-survival tests (#469 + #470 contract).

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

gitea_mcp_server.py

@@ -519,6 +519,16 @@ def verify_preflight_purity(
                 _preflight_resolved_task, task
             )
         )
+    if (
+        task is not None
+        and _preflight_resolved_task is not None
+        and task != _preflight_resolved_task
+    ):
+        raise RuntimeError(
+            "Pre-flight task mismatch: "
+            f"resolved '{_preflight_resolved_task}' but mutation requires "
+            f"'{task}' (fail closed)"
+        )
 
     ctx = _resolve_author_mutation_context(worktree_path)
     workspace = ctx["workspace_path"]