feat: raise agent max tool-calls cap to 500, default to 50 (#1163)

On large codebases the agent's discovery and implementation phases
routinely exceeded the previous spinner cap of 100 tool calls,
interrupting work mid-task. Raise the selectable upper bound to 500 and
bump the default from 25 to 50 for a better out-of-box experience.

The limit remains a soft stop: AgentLoopTracker returns a "provide your
best answer" message to the LLM rather than hard-killing the run.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: stephanj

src/main/java/com/devoxx/genie/model/Constant.java

@@ -61,7 +61,14 @@ private Constant() {
     public static final Integer MCP_APPROVAL_TIMEOUT = 60;
 
     // Agent mode settings
-    public static final int AGENT_MAX_TOOL_CALLS = 25;
+    public static final int AGENT_MAX_TOOL_CALLS = 50;
+    /**
+     * Upper bound for the agent max tool-calls spinner (issue #1163). Large codebases
+     * regularly need more research/implementation iterations than the previous cap of 100
+     * allowed, which interrupted work mid-task. When this limit is reached the agent is
+     * asked to wrap up with its best answer rather than being hard-stopped.
+     */
+    public static final int AGENT_MAX_TOOL_CALLS_UPPER_BOUND = 500;
     /**
      * Wall-clock cap (seconds) for a single MCP/agent prompt conversation.
      * Simple (non-agent, non-MCP) prompts use the per-request timeout instead. The agent cap is

src/main/java/com/devoxx/genie/ui/settings/agent/AgentSettingsComponent.java

@@ -34,7 +34,7 @@ public class AgentSettingsComponent extends AbstractSettingsComponent {
     private final JBCheckBox enableAgentModeCheckbox =
             new JBCheckBox("Enable agent mode", stateService.getAgentModeEnabled());
     private final JBIntSpinner maxToolCallsSpinner =
-            new JBIntSpinner(stateService.getAgentMaxToolCalls() != null ? stateService.getAgentMaxToolCalls() : AGENT_MAX_TOOL_CALLS, 1, 100);
+            new JBIntSpinner(stateService.getAgentMaxToolCalls() != null ? stateService.getAgentMaxToolCalls() : AGENT_MAX_TOOL_CALLS, 1, AGENT_MAX_TOOL_CALLS_UPPER_BOUND);
     private final JBCheckBox autoApproveReadOnlyCheckbox =
             new JBCheckBox("Auto-approve read-only tools (read_file, list_files, search_files, fetch_page)", stateService.getAgentAutoApproveReadOnly());
     private final JBCheckBox writeApprovalRequiredCheckbox =