ask: rename ask_operator → ask + optional 'to' for agent-to-agent Q&A

CLAUDE.md

@@ -22,7 +22,10 @@ hive-c0re/         host daemon + CLI (one binary, subcommand-dispatched)
   src/broker.rs         sqlite Message store + broadcast channel for SSE +
                          hourly vacuum of delivered>30d
   src/approvals.rs      sqlite Approval queue + kinds
-  src/operator_questions.rs  sqlite question queue backing `ask_operator`
+  src/operator_questions.rs  sqlite question queue backing `ask` /
+                         `answer` (both operator + agent-to-agent)
+  src/questions.rs      shared dispatch for `Ask` / `Answer` —
+                         used by both agent + manager surfaces
   src/reminder_scheduler.rs  5s poll loop: drains due reminders,
                          resolves file_path container→host, persists
                          payload + delivers pointer string
@@ -31,8 +34,9 @@ hive-c0re/         host daemon + CLI (one binary, subcommand-dispatched)
   src/crash_watch.rs    poll every 10s; fire HelperEvent::ContainerCrash
                          when a previously-running container disappears
                          without an operator-initiated transient
-  src/coordinator.rs    shared state (broker/approvals/questions/transient/
-                         sockets) + tombstone enumeration + kick_agent
+  src/coordinator.rs    shared state (broker/approvals/operator_questions/
+                         transient/sockets) + tombstone enumeration +
+                         kick_agent + notify_agent (helper-event push)
   src/actions.rs        approve/deny/destroy (transient-aware)
   src/auto_update.rs    startup rebuild scan + ensure_manager +
                          meta::lock_update_hyperhive bump
@@ -161,11 +165,21 @@ Prune freely.
   domain tooling — the agent flake's `inputs` block pulls
   the external flake, `agent.nix` references it via
   `flakeInputs.<name>.packages.${pkgs.system}.default`.
-- **Just landed:** `mcp__hyperhive__ask_operator` is now on
-  the sub-agent surface too (not just the manager). Answer
-  routes back to whichever agent asked via
-  `coord.notify_agent`; the dashboard already shows the
-  asker on each question row.
+- **Just landed:** `ask_operator` → `ask` rename + optional
+  `to: <agent>` param for agent-to-agent structured Q&A.
+  Recipient defaults to the operator (dashboard); peer
+  questions land in the target's inbox as `QuestionAsked`
+  events and the recipient replies via new `answer(id,
+  answer)` tool. Answer always flows back as
+  `QuestionAnswered { id, question, answer, answerer }`
+  (renamed from `OperatorAnswered`; `answerer` distinguishes
+  operator vs peer vs `ttl-watchdog`). Authorisation:
+  operator-targeted questions can only be answered by the
+  operator; agent-targeted by the named target (or the
+  operator as override). Self-ask rejected. Shared dispatch
+  lives in `hive-c0re/src/questions.rs`. Dashboard's
+  `pending()` filters on `target IS NULL` so peer questions
+  never leak into the operator's queue.
 - **Just landed:** dashboard now has a terminal-style
   compose textbox under the message-flow stream — `@name`
   picks the recipient (sticky in localStorage, auto-