Add registry sort/pagination features and improve code step dialog

Registry:
- Add owner and rating sort options to both server endpoints
- Add letter-based prefix filtering (A-Z, #) with server-side validation
- LEFT JOIN tool_stats for average_rating/rating_count in responses
- Add interactive numbered page buttons with sliding window and ellipsis
- Add letter bar UI (shown when sorting by name) with highlight state
- Auto-select asc/desc order based on sort field
- Disable cell editing on results table
- Client: add order and prefix params to list_tools/search_tools

Code step dialog:
- Split AI prompt into user instruction input and collapsible wrapper
- User types plain instruction, wrapper is hidden by default
- Injection of user text into wrapper via {user_instruction} placeholder
- Increase dialog minimum height to 750px

Runner:
- Support variable substitution in prompt step provider name

Co-Authored-By: Claude Opus 4.5 <[email protected]>

src/cmdforge/gui/dialogs/step_dialog.py

@@ -177,7 +177,7 @@ class CodeStepDialog(QDialog):
     def __init__(self, parent, step: CodeStep = None, available_vars: list = None):
         super().__init__(parent)
         self.setWindowTitle("Edit Code Step" if step else "Add Code Step")
-        self.setMinimumSize(900, 600)
+        self.setMinimumSize(900, 750)
         self._step = step
         self._available_vars = available_vars or ["input"]
         self._worker = None
@@ -254,16 +254,30 @@ class CodeStepDialog(QDialog):
         provider_layout.addStretch()
         ai_layout.addLayout(provider_layout)
 
-        # Prompt editor
-        prompt_label = QLabel("Describe what you want the code to do:")
-        ai_layout.addWidget(prompt_label)
+        # User instruction input (always visible)
+        instruction_label = QLabel("Describe what you want the code to do:")
+        ai_layout.addWidget(instruction_label)
 
-        self.ai_prompt_input = QPlainTextEdit()
-        self.ai_prompt_input.setPlaceholderText(
+        self.user_instruction_input = QPlainTextEdit()
+        self.user_instruction_input.setPlaceholderText(
             "Example: Parse the input as JSON and extract the 'name' field"
         )
-        # Set default prompt template
+        self.user_instruction_input.setMaximumHeight(100)
+        ai_layout.addWidget(self.user_instruction_input, 1)
+
+        # Collapsible prompt wrapper section
+        self.wrapper_toggle = QPushButton("Edit prompt wrapper ▶")
+        self.wrapper_toggle.setFlat(True)
+        self.wrapper_toggle.setStyleSheet(
+            "QPushButton { color: #4a5568; font-size: 12px; text-align: left; "
+            "padding: 2px 0; } QPushButton:hover { color: #2d3748; }"
+        )
+        self.wrapper_toggle.clicked.connect(self._toggle_wrapper)
+        ai_layout.addWidget(self.wrapper_toggle)
+
+        self.ai_prompt_input = QPlainTextEdit()
         self._set_default_prompt()
+        self.ai_prompt_input.hide()
         ai_layout.addWidget(self.ai_prompt_input, 2)
 
         # Generate button
@@ -306,6 +320,15 @@ class CodeStepDialog(QDialog):
 
         layout.addLayout(buttons)
 
+    def _toggle_wrapper(self):
+        """Toggle visibility of the prompt wrapper editor."""
+        if self.ai_prompt_input.isVisible():
+            self.ai_prompt_input.hide()
+            self.wrapper_toggle.setText("Edit prompt wrapper ▶")
+        else:
+            self.ai_prompt_input.show()
+            self.wrapper_toggle.setText("Edit prompt wrapper ▼")
+
     def _set_default_prompt(self):
         """Set the default AI prompt template."""
         vars_formatted = ', '.join(f'"{{{v}}}"' for v in self._available_vars)
@@ -317,7 +340,7 @@ Example:
 my_var = \"\"\"{{input}}\"\"\"
 result = my_var.upper()
 
-INSTRUCTION: [Describe what you want the code to do]
+INSTRUCTION: {{user_instruction}}
 
 CURRENT CODE:
 {{code}}
@@ -329,14 +352,20 @@ IMPORTANT: Return ONLY executable inline Python code. No function definitions, n
 
     def _generate_code(self):
         """Generate code using AI."""
-        prompt_template = self.ai_prompt_input.toPlainText().strip()
-        if not prompt_template:
-            self.ai_output.setHtml("<span style='color: #e53e3e;'>Please enter a prompt</span>")
+        user_instruction = self.user_instruction_input.toPlainText().strip()
+        if not user_instruction:
+            self.ai_output.setHtml("<span style='color: #e53e3e;'>Please describe what you want the code to do</span>")
             return
 
-        # Replace {code} placeholder with current code
+        prompt_template = self.ai_prompt_input.toPlainText().strip()
+        if not prompt_template:
+            self.ai_output.setHtml("<span style='color: #e53e3e;'>Prompt wrapper is empty</span>")
+            return
+
+        # Inject user instruction and current code into the wrapper
         current_code = self.code_input.toPlainText().strip() or "# No code yet"
-        prompt = prompt_template.replace("{code}", current_code)
+        prompt = prompt_template.replace("{user_instruction}", user_instruction)
+        prompt = prompt.replace("{code}", current_code)
 
         provider = self.ai_provider_combo.currentText()