docs: describe the push_todo lifecycle-notice migration

docs/approvals.md

@@ -132,8 +132,8 @@ without it has nothing of its own to withdraw.
 
 `InitConfig` approvals seed a brand-new agent's proposed config repo.
 On approve, hive-c0re seeds it with a default `agent.nix` template and
-sends `HelperEvent::ConfigReady { agent }` to the submitting agent's
-inbox via `notify_submitter`. The submitting agent reviews, edits, and
+pushes a todo (`push_todo_submitter`) into the submitting agent's
+in-container store. The submitting agent reviews, edits, and
 commits the template; the operator then **spawns** the agent (the
 `Spawn` approval / `◆ R3QU3ST SP4WN` button), which creates the
 container from that config. From then on, config changes go through a
@@ -626,12 +626,6 @@ root agent. Variants (`hive_sh4re::HelperEvent`):
 - `ApprovalResolved { id, agent, commit_ref, status, note }` —
   fired by `actions::approve` + `actions::deny` whenever an
   approval transitions to its terminal state.
-- `Rebuilt { agent, ok, note }` — `auto_update::rebuild_agent`
-  (covers startup scan + manual `/rebuild` from dashboard) +
-  the `MergeConfigPr` deploy.
-- `Killed { agent }` — admin `HostRequest::Kill` + dashboard
-  `/kill` + the `Kill` MCP tool.
-- `Destroyed { agent }` — `actions::destroy`.
 - `ContainerCrash { agent, note }` — `crash_watch`: a previously-
   running container went away with no operator-initiated transient
   state (Stopping / Restarting / Destroying / Rebuilding) AND no
@@ -640,16 +634,6 @@ root agent. Variants (`hive_sh4re::HelperEvent`):
   lifecycle op finishes between two crash-watch polls and the
   container shows briefly as "stopped without transient" before
   the next start). The root agent can `start` it again or escalate.
-- `NeedsLogin { agent }` — sub-agent has no claude session yet.
-  The root agent can't act directly (interactive OAuth); typically flags
-  the operator.
-- `LoggedIn { agent }` — sub-agent just completed login. The root agent
-  often greets the agent on this event.
-- `ConfigReady { agent }` — a new agent's proposed config repo was
-  just seeded (post-`InitConfig` approval). The root agent can now
-  edit `/agents/<agent>/config/agent.nix`, commit the changes, and
-  hand off to the operator to **spawn** the agent (the `Spawn`
-  approval creates the container from that config).
 - `NeedsUpdate { agent }` — sub-agent's recorded flake rev is
   stale. The root agent calls `update(name)` to rebuild — idempotent,
   no approval required.
@@ -662,20 +646,33 @@ root agent. Variants (`hive_sh4re::HelperEvent`):
   The recipient responds via `Answer { id, answer }` and the
   asker sees the matching `QuestionAnswered`.
 
-Optional `sha` field on `ApprovalResolved` and `Rebuilt` carries the
-canonical hive-c0re-vouched commit sha. Optional `tag` on the same two
-carries the deploy bookkeeping tag — `deployed/<id>` on a successful
-build or `failed/<id>` on a failed one, planted by the `MergeConfigPr`
-deploy. Both fields are `Option`: `None` on the paths that don't deploy
-a new commit (spawn / init_config / meta-update / deny, and
+The rest of the original lifecycle notices — `Rebuilt`, `Killed`,
+`Destroyed`, `NeedsLogin`, `LoggedIn`, `ConfigReady` — were pure "FYI,
+check when convenient" events with no reason to drive an immediate
+turn, so they've been migrated off `HelperEvent` onto
+`push_todo`/`push_todo_submitter` (see above): `agent_todo_socket`
+push instead of a broker message, `subsystem = "core"`,
+`key = "<event>:<agent>"` for dedup, one free-text `summary` in place
+of the old structured fields (`rebuilt_todo_summary` renders
+`Rebuilt`'s former `ok`/`note`/`sha`/`tag` into that string).
+
+Optional `sha` field on `ApprovalResolved` carries the canonical
+hive-c0re-vouched commit sha. Optional `tag` carries the deploy
+bookkeeping tag — `deployed/<id>` on a successful build or
+`failed/<id>` on a failed one, planted by the `MergeConfigPr` deploy.
+Both fields are `Option`: `None` on the paths that don't deploy a new
+commit (spawn / init_config / meta-update / deny, and
 `auto_update::rebuild_agent` reapplying the existing main, or the
 dashboard `↻ R3BU1LD` button when the lock didn't move). When set,
 `git show <sha>` against `/agents/<n>/applied.git` inside the
 bootstrap container yields the exact tree that was referenced.
 
-To add a new event: new `HelperEvent` variant + call sites + update
-`prompts/system.md` (`<!-- role:manager -->` block, the lifecycle-
-event list) so the root agent knows the new shape.
+To add a new lifecycle notice: if it needs to drive an immediate turn
+(a live conversation like `Ask`/`Answer`, or something genuinely
+urgent), add a `HelperEvent` variant + call sites + update
+`prompts/system.md`'s message-event list. If it's "FYI, check when
+convenient," call `push_todo`/`push_todo_submitter` directly instead —
+no new wire type needed.
 
 ## Auto-update on startup