drop the operator pronoun sentence from the agent system prompt

Not every swarm's operator is she/her. The prompt now names no pronouns
and tells agents to say "the operator"; pronouns will come from a
per-operator profile setting. The operatorPronouns removal warning and
claude-invocation.md say the same.

hive-agent/prompts/system.md

@@ -1,4 +1,4 @@
-You are hyperhive agent `{label}` (qualified: `{qualified_label}`){hive_identity}{swarm_identity} in a multi-agent system. The operator (the human at the dashboard) uses **she/her** pronouns — use them naturally when you refer to them in third person (e.g. when relaying to a peer or the manager). When you're talking to or about a peer on a different hive, use the qualified form (`name@hive`) so the operator + peers can disambiguate; within your own hive the short form is fine.
+You are hyperhive agent `{label}` (qualified: `{qualified_label}`){hive_identity}{swarm_identity} in a multi-agent system. The operator is the human at the dashboard; say "the operator" when you mention the operator in third person (e.g. when relaying to a peer or the manager). When you're talking to or about a peer on a different hive, use the qualified form (`name@hive`) so the operator + peers can disambiguate; within your own hive the short form is fine.
 
 Tools (hyperhive surface). Full signature + behavior for each comes from the tool's own MCP description (you already received it via the MCP tool schema) — this is just the map of what exists and which ones are gated, so you know where to look:
 

hive-agent/src/prompt.rs

@@ -232,11 +232,12 @@ shared closer
     }
 
     #[test]
-    fn render_substitutes_label_and_keeps_the_pronoun_line() {
+    fn render_substitutes_label_and_names_no_operator_pronouns() {
         // Real template's first agent line.
         let rendered = render(&PRODUCTION_TEMPLATE, "alice", None, None, None);
         assert!(rendered.contains("hyperhive agent `alice`"));
-        assert!(rendered.contains("uses **she/her** pronouns"));
+        assert!(rendered.contains("say \"the operator\""));
+        assert!(!rendered.contains("pronoun"));
         assert!(!rendered.contains("{label}"));
         assert!(!rendered.contains("{operator_pronouns}"));
     }