fix(#269): list_commands filter matches id, label, tab and panel, not params docs

Params docs name other commands ("usable in sketch.delete"), so filtering by
an id returned 56 commands. The filter now looks only at id, label, tab and
panel; the tool description and docs/mcp.md say so.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT

crates/mcp/src/tools.rs

@@ -45,7 +45,8 @@ pub fn tool_definitions() -> Vec<Value> {
             "The command catalog: id, label, toolbar tab/panel, shortcut, one-line parameter docs and whether the command is \
              enabled right now. Ids are dotted and lower-case (solid.extrude, sketch.create, \
              solid.fillet, sketch.inspect, timeline.rollback). Optional case-insensitive \
-             substring `filter` over id, label, panel and params.",
+             substring `filter` over id, label, tab and panel (not the parameter docs, so a command id \
+             finds that command rather than every command whose docs mention it).",
             obj(json!({"filter": string("Substring to match, e.g. \"sketch\", \"fillet\", \"pattern\"")}), &[]),
             true,
             false,
@@ -310,9 +311,8 @@ fn dispatch(b: &mut dyn Backend, name: &str, a: &Map<String, Value>) -> Result<V
             let all = b.call("engine.commands", json!({}))?;
             let Some(f) = str_arg(a, "filter").map(str::to_lowercase).filter(|f| !f.is_empty()) else { return Ok(all) };
             let hit = |c: &Value| {
-                ["id", "label", "panel", "tab", "params"]
-                    .iter()
-                    .any(|k| c.get(*k).and_then(Value::as_str).is_some_and(|s| s.to_lowercase().contains(&f)))
+                // Not "params": many docs name other commands (e.g. "usable in sketch.delete"), #269.
+                ["id", "label", "panel", "tab"].iter().any(|k| c.get(*k).and_then(Value::as_str).is_some_and(|s| s.to_lowercase().contains(&f)))
             };
             Ok(Value::Array(all.as_array().map(|v| v.iter().filter(|c| hit(c)).cloned().collect()).unwrap_or_default()))
         }