Move C-state name cleaning to agent for smaller JSON

- Agent now extracts "C" + digits pattern (C3, C10) using char parsing
- Removes suffixes like "_ACPI", "_MWAIT" at source
- Reduces JSON payload size over ZMQ
- No regex dependency - uses fast char iteration (~1μs overhead)
- Robust fallback to original name if pattern not found
- Dashboard simplified to use clean names directly

Bump version to v0.1.212

Co-Authored-By: Claude <noreply@anthropic.com>

dashboard/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard"
-version = "0.1.211"
+version = "0.1.212"
 edition = "2021"
 
 [dependencies]

dashboard/src/ui/widgets/system.rs

@@ -144,13 +144,10 @@ impl SystemWidget {
         }
 
         // Format top 3 C-states with percentages: "C10:79% C8:10% C6:8%"
-        // Strip suffixes like "_ACPI" from state names
+        // Agent already sends clean names (C3, C10, etc.)
         self.cpu_cstates
             .iter()
-            .map(|cs| {
-                let clean_name = cs.name.split('_').next().unwrap_or(&cs.name);
-                format!("{}:{:.0}%", clean_name, cs.percent)
-            })
+            .map(|cs| format!("{}:{:.0}%", cs.name, cs.percent))
             .collect::<Vec<_>>()
             .join(" ")
     }