fix(server): Add missing descriptions to MCP tools in list handler

- Added missing tool descriptions to generate_standup_report, get_environment_details, and list_context_workspaces so the LLM correctly parses them during MCP handshake.

server/src/handlers.rs

@@ -292,7 +292,7 @@ impl MemoryHandler {
                     ),
                     crate::mcp::tool_def::<GenerateStandupReportTool>(
                         "generate_standup_report",
-                        "",
+                        "Generate a standup report summarizing recent work, blockers, and next steps.",
                     ),
                     crate::mcp::tool_def::<RegisterEnvironmentTool>(
                         "register_environment",
@@ -300,7 +300,7 @@ impl MemoryHandler {
                     ),
                     crate::mcp::tool_def::<GetEnvironmentDetailsTool>(
                         "get_environment_details",
-                        "",
+                        "Get detailed information about a specific deployment environment.",
                     ),
                     crate::mcp::tool_def::<AddPrChecklistItemTool>(
                         "add_pr_checklist_item",
@@ -336,7 +336,7 @@ impl MemoryHandler {
                     ),
                     crate::mcp::tool_def::<ListContextWorkspacesTool>(
                         "list_context_workspaces",
-                        "",
+                        "List all saved context workspaces.",
                     ),
                     crate::mcp::tool_def::<OmniSearchTool>(
                         "omni_search",