Revert "Fix Windows UTF-8 encoding errors in spec file reading (#744)" (#770)

This reverts commit a01634d548.

apps/backend/spec/compaction.py

@@ -141,7 +141,7 @@ def gather_phase_outputs(spec_dir: Path, phase_name: str) -> str:
         file_path = spec_dir / filename
         if file_path.exists():
             try:
-                content = file_path.read_text(encoding="utf-8")
+                content = file_path.read_text()
                 # Limit individual file size
                 if len(content) > 10000:
                     content = content[:10000] + "\n\n[... file truncated ...]"

apps/backend/spec/pipeline/agent_runner.py

@@ -82,7 +82,7 @@ class AgentRunner:
             return False, f"Prompt not found: {prompt_path}"
 
         # Load prompt
-        prompt = prompt_path.read_text(encoding="utf-8")
+        prompt = prompt_path.read_text()
         debug_detailed(
             "agent_runner",
             "Loaded prompt file",

apps/backend/spec/validate_pkg/validators/spec_document_validator.py

@@ -40,12 +40,7 @@ class SpecDocumentValidator:
             fixes.append("Create spec.md with required sections")
             return ValidationResult(False, "spec", errors, warnings, fixes)
 
-        try:
-            content = spec_file.read_text(encoding="utf-8")
-        except (OSError, UnicodeDecodeError) as e:
-            errors.append(f"Failed to read spec.md: {e}")
-            fixes.append("Ensure spec.md is a valid UTF-8 encoded file")
-            return ValidationResult(False, "spec", errors, warnings, fixes)
+        content = spec_file.read_text()
 
         # Check for required sections
         for section in SPEC_REQUIRED_SECTIONS:

apps/backend/spec/validation_strategy.py

@@ -171,15 +171,9 @@ def detect_project_type(project_dir: Path) -> str:
         # Try to detect API framework
         deps_text = ""
         if requirements.exists():
-            try:
-                deps_text = requirements.read_text(encoding="utf-8").lower()
-            except (OSError, UnicodeDecodeError):
-                pass  # Skip if file is unreadable
+            deps_text = requirements.read_text().lower()
         if pyproject.exists():
-            try:
-                deps_text += pyproject.read_text(encoding="utf-8").lower()
-            except (OSError, UnicodeDecodeError):
-                pass  # Skip if file is unreadable
+            deps_text += pyproject.read_text().lower()
 
         if "fastapi" in deps_text or "flask" in deps_text or "django" in deps_text:
             return "python_api"